Glossary of Hydrographic terms meanings

Glossary of Hydrographic terms meanings

 

Abeam meaning Aberration of light meaning Abrasion meaning Abscissa meaning Absolute accuracy meaning Absolute error meaning Absolute orientation meaning Absolute stereoscopic parallax meaning Absorption atmospheric meaning Abyssal meaning Abyssal gap meaning Abyssal hills meaning Abyssal plain meaning Acceleration meaning Acceleration angular meaning Acceleration of gravity meaning Accidental error meaning Acclivity meaning Accommodation meaning Accretion meaning Accuracy meaning Accuracy absolute meaning Accuracy relative meaning Accuracy repeatable meaning Achromat meaning Achromatic lens meaning Aclinic line meaning Acoustic meaning Acoustic bearing meaning Acoustic line of position meaning Acoustic navigation meaning Acoustic sounding meaning Acoustic wave meaning Active satellite meaning Active system meaning Active tracking system meaning Adiabatic process meaning Adiabatic temperature change meaning Adjacent coasts meaning Adjusted position meaning Adjustment meaning Aerial meaning Aerial camera meaning Aerial navigation meaning Aerial photogrammetry meaning Aerial photograph meaning Aerial photography meaning Aerial survey meaning Aerial triangulation meaning Aerology meaning Aeromarine light meaning Aeronautical beacon meaning Aeronautical chart meaning Aeronautical ground light meaning Aeronomy meaning Aerotriangulation meaning Affluent meaning Afloat meaning Age of diurnal inequality meaning Age of parallax inequality meaning Age of phase inequality meaning Age of the moon meaning Age of tide meaning Agger meaning Aggradation meaning Agonic line meaning Aground meaning Ahead meaning Aid to navigation meaning Aiming line meaning Air almanac meaning Air base meaning Air camera meaning Air mass meaning Air navigation meaning Air photograph meaning Air photography meaning Air sextant meaning Air speed meaning Air station meaning Albedo meaning Alga meaning Aliasing meaning Alidade meaning Alignment meaning Alignment correctiontape meaning Alignment of base meaning Alkalinity meaning Almanac meaning Almanac air meaning Almanac nautical meaning Almucantar meaning Alphanumeric meaning Alt-azimuth instrument meaning Altimeter meaning Altimeter barometric meaning Altimeter pulse radio meaning Altimeter radar meaning Altimeter radio meaning Altimetry meaning Altitude meaning Altitude apparent meaning Altitude ex-meridian meaning Altitude flight meaning Altitude meridian meaning Altitude observed meaning Altitude rectified meaning Altitude sextant meaning Altitude true meaning Altitude difference meaning Altocumulus meaning Altostratus meaning Aluminium sheet meaning Ambient noise meaning Ambiguity meaning Amidships meaning Ampere meaning Amphidromic point meaning Amplitude meaning Amplitude modulation meaning Anaglyph meaning Anaglyphic map meaning Analemma meaning Anallatic lens meaning Analogue meaning Analogue computer meaning Analytical or analytic photogrammetry meaning Anastigmatic meaning Anchorage meaning Anchorage buoys meaning Anchor buoy meaning Anchor ice meaning Anemometer. meaning Anemogram meaning Anemograph meaning Aneroid barometer meaning Aneroid capsule meaning Angle check meaning Angle concluded meaning Angle conversion meaning Angle crossing meaning Angle danger meaning Angle drift meaning Angle hour meaning Angle masthead meaning Angle parallactic meaning Angle phase meaning Angle slope meaning Angle vectorial meaning Angle of convergence meaning Angle of cut meaning Angle of depression meaning Angle of elevation meaning Angle of incidence meaning Angle of reflection meaning Angle of refraction meaning Angstroem meaning Angular acceleration meaning Angular distance meaning Angular distortion meaning Angular parallax meaning Angular rate meaning Angular speed meaning Angular velocity meaning Annotation meaning Annual aberration meaning Annual change meaning Annual inequality meaning Annual parallax meaning Annual variation meaning Annular eclipse meaning Anomalistic month meaning Anomalistic year meaning Anomaly meaning Anomaly gravity meaning Anomaly magnetic meaning Antarctic circle meaning Antenna meaning Antenna directional meaning Antenna omnidirectional meaning Antenna screened meaning Antenna unidirectional meaning Anthelion meaning Anticline meaning Anticyclone meaning Antimeridian meaning Antipodes meaning Antiselena meaning Anti-trade meaning Aperture relative meaning Aperture of antenna meaning Aperture stop meaning Apex meaning Apex solar meaning Aphelion meaning Aphotic meaning Apochromatic lens meaning Apogean tides meaning Apogee meaning Apparent altitude meaning Apparent horizon meaning Apparent motion meaning Apparent noon meaning Apparent position meaning Apparent precession meaning Apparent shoreline meaning Apparent solar day meaning Apparent solar time meaning Apparent sun meaning Apparent time meaning Apparent wind meaning Approximate position meaning Apron meaning Apsispl meaning Arc astronomical meaning Archipelagic apron meaning Archipelagic baselines meaning Archipelagic sea lane meaning Archipelagic state meaning Archipelagic waters meaning Archipelago meaning Arc of triangulation meaning Arc of visibility meaning Arctic meaning Arc to chord correction meaning Area meaning Area clearance meaning Area to be avoided meaning Area survey meaning Argillaceous meaning Arming meaning Arm of the sea meaning Arrays meaning Articulated beacon meaning Articulated light meaning Artificial horizon meaning Artificial intelligence meaning Artificial installation meaning Artificial island meaning Artificial satellite meaning Ascending node meaning Ashore meaning Assumed position meaning Astenosphere meaning Astern meaning Asteroid meaning Astigmatism meaning Astro compass meaning Astrolabe meaning Astrolabe prismatic meaning Astrometry meaning Astronautics meaning Astro-navigation meaning Astronomical arc meaning Astronomical azimuth meaning Astronomical control meaning Astronomical day meaning Astronomical equator meaning Astronomical latitude meaning Astronomical longitude meaning Astronomical meridian meaning Astronomical observations meaning Astronomical parallel meaning Astronomical position meaning Astronomical refraction meaning Astronomical station meaning Astronomical tide meaning Astronomical time meaning Astronomical transit meaning Astronomical traverse meaning Astronomical triangle meaning Astronomical twilight meaning Astronomical year meaning Astronomy meaning Astronomy geodetic meaning Astronomy nautical or navigational meaning Atlas meaning Atmosphere meaning Atmosphere free meaning Atmosphere icao meaning Atmosphere standard meaning Atmospheric meaning Atmospheric drag meaning Atmospheric pressure meaning Atmospheric refraction meaning Atmospheric window meaning Atoll meaning Atom meaning Atomic clock meaning Atomic time international meaning Attenuation meaning Audiofrequency meaning Aurora meaning Aurora australis meaning Aurora borealis meaning Autocollimator meaning Automated cartography meaning Automatic floating station meaning Automatic gain control meaning Automatic plotter meaning Automatic tide gauge meaning Automatic volume control meaning Automation meaning Autopositive meaning Autumnal equinox meaning Avulsion meaning Axis meaning Axis horizontal meaning Axis optical meaning Axis polar meaning Axis principal meaning Axis trunnion meaning Axis vertical meaning Axis of camera meaning Axis of channel meaning Axis of collimation meaning Axis of homology meaning Axis of lens meaning Axis of optical system meaning Axis of perspective meaning Axis of spirit level meaning Axis of tilt meaning Azimuth meaning Azimuth of a celestial body meaning Azimuth astronomical meaning Azimuth astronomical determination of meaning Azimuth back meaning Azimuth forward meaning Azimuth geodetic meaning Azimuth grid meaning Azimuth laplace meaning Azimuth magnetic meaning Azimuth reverse meaning Azimuth true meaning Azimuthal equidistant projection meaning Azimuthal orthomorphic projection meaning Azimuthal projection meaning Azimuth angle meaning Azimuth circle meaning Azimuth diagram meaning Azimuth mark meaning Back azimuth meaning Backbeach meaning Backing wind meaning Backrush meaning Backrush current meaning Backshore meaning Backsight meaning Backwash meaning Backwater meaning Ballistic camera meaning Band of colour meaning Band of frequency meaning Bandwidth meaning Bank meaning Bar meaning Bar buoy meaning Bar check meaning Bar scale meaning Bar sweeping meaning Baroclinity meaning Barogram meaning Barograph meaning Barometer meaning Barometer aneroid meaning Barometer marine meaning Barometer mercurial or mercury meaning Barometer recording meaning Barometric altimeter meaning Barometric elevation meaning Barometric gradient meaning Barometric levelling meaning Barometric pressure meaning Barotropy meaning Barrel buoy meaning Barrier reef meaning Barye meaning Barysphere meaning Basal coplane meaning Basal orientation meaning Basal plane meaning Base meaning Base apparatus meaning Base course of a vessel meaning Base direction meaning Base extension triangulation british terminology meaning Base height ration meaning Base line meaning Baseline archipelagic meaning Baseline normal meaning Baseline straight meaning Base line extension meaning Base map meaning Base net meaning Basepoint meaning Base tape or wire meaning Base terminals meaning Base tilt meaning Basic control meaning Basic survey meaning Basin meaning Basin tidal meaning Bathymeter meaning Bathymetric meaning Bathymetric chart meaning Bathymetric map meaning Bathymetry meaning Bathyscaphe or bathyscaph meaning Bathysphere meaning Bathythermogram meaning Bathythermograph meaning Bay meaning Bay closing line meaning Bay ice meaning Bayou meaning Beach meaning Beach comber meaning Beacon meaning Beacon aeronautical meaning Beacon hazard meaning Beacon identification meaning Beacon light or lighted meaning Beacon omnidirectional meaning Beacon radio meaning Beacon responder meaning Beacon transponder meaning Beaconage meaning Beam meaning Beam compass meaning Beam sea meaning Beam width meaning Beam wind meaning Bearing meaning Bearing acoustic meaning Bearing compass meaning Bearing danger meaning Bearing great circle meaning Bearing grid meaning Bearing magnetic meaning Bearing mercatorialor mercator meaning Bearing polar meaning Bearing radar meaning Bearing radio meaning Bearing reciprocal meaning Bearing relative meaning Bearing rhumb meaning Bearing sonic meaning Bearing transit meaning Bearing true meaning Bearing circle meaning Bearing plate meaning Beat meaning Beaufort wind scale meaning Bed meaning Bedrock meaning Bel meaning Bell buoy meaning Belt meaning Bench meaning Bench mark benchmarks meaning Beneaped or neaped meaning Benthic division meaning Benthos meaning Berg meaning Bergy bit meaning Berm meaning Berm line meaning Berth meaning Beset meaning Bessel's spheroid meaning Between-the-lens shutter meaning Bias meaning Bifurcation meaning Bifurcation buoy meaning Bight meaning Bilby steel tower meaning Billow meaning Binary meaning Binnacle meaning Binoculars meaning Binocular vision meaning Biology marine meaning Bioluminescence meaning Biosphere meaning Bissextile year meaning Bit meaning Blind rollers meaning Blind seas meaning Blind zone meaning Blip meaning Blizzard meaning Block correction meaning Blow up meaning Bluff meaning Blunder meaning Boat compass meaning Boat grid meaning Boat sheet u.S meaning Boat slip meaning Bog meaning Bold coast meaning Bollard meaning Boom meaning Boomer meaning Border meaning Border break meaning Border of chart meaning Borderland meaning Border scale meaning Bore meaning Boring meaning Bottom meaning Bottom nature of meaning Bottom characteristics meaning Bottom contour chart meaning Bottom friction meaning Bottom ice meaning Bottom profiler meaning Bottom relief survey meaning Bottom sample meaning Bottom sampler meaning Bottom sampling meaning Bottom sediments meaning Bouguer anomaly meaning Boulder meaning Boulder clay meaning Boundary meaning Boundary layer meaning Boundary monument meaning Boundary wave meaning Bourdon tube meaning Bowditch rule meaning Box compass meaning Box gauge meaning Box sextant meaning Brackish water meaning Brash ice meaning Breaker meaning Breaking of waves meaning Breakwater meaning Breeze meaning Bridge 1 meaning Bridge bascule meaning Bridge draw meaning Bridge lift meaning Bridge swing meaning Bridge clearance meaning Bridging meaning Broad on the beam meaning Broad on the bow meaning Broad on the quarter meaning Broadcast meaning Broadcast ephemeris meaning Broadside on meaning Broken telescope transit meaning Broken water meaning Brook meaning Bubble spirit or sensitive meaning Bubble sextant meaning Bucket temperature meaning Bulkhead meaning Buoy automatic meaning Buoy bifurcation meaning Buoy cable meaning Buoy cardinal meaning Buoy fairway meaning Buoy lateral meaning Buoy life meaning Buoy light or lighted meaning Buoy lighted sound meaning Buoy mooring meaning Buoy radar meaning Buoy radiobeacon meaning Buoy sound meaning Buoy special meaning Buoy super meaning Buoy survey meaning Buoyage meaning Buoyancy meaning Buoyancy centre of meaning Buoyant beacon meaning Buoy-control method meaning Butte meaning Byte meaning Cable meaning Cable coaxial meaning Cable degaussing meaning Cable leader meaning Cable submarine meaning Cable buoy meaning Cable length meaning Cable sign meaning C/a code meaning Cadastral map meaning Cadastral survey meaning Cadastre meaning Cairn meaning Caisson meaning Calcareous meaning Calculator meaning Calendar line meaning Calibrate meaning Calibrated focal length meaning Calibration meaning Calibration direct base meaning Calibration direct simultaneous meaning Calibration indirect position meaning Calibration indirect variation meaning Calibration of compass meaning Calling-in point meaning Calling the soundings meaning Calm meaning Calorie meaning Calving meaning Camber meaning Camera meaning Camera aerial meaning Camera ballistic meaning Camera continuous-strip meaning Camera deep sea meaning Camera multiple lens meaning Camera photogrammetric meaning Camera stereometric meaning Camera surveying or mapping meaning Camera terrestrial meaning Camera tracking meaning Camera axis meaning Camera station meaning Canal meaning Can buoy meaning Candela meaning Candlepower meaning Cantilever extension meaning Canyon meaning Canyon submarine meaning Cap meaning Capacitor meaning Cape meaning Capillary wave meaning Card meaning Cardanic suspension meaning Cardinal points meaning Cardinal system meaning Careen meaning Careening grid meaning Carrier meaning Carrier wave meaning Cartogram meaning Cartographer meaning Cartography meaning Cartouche meaning Cassini projection meaning Cast meaning Catenary meaning Catenary correction tape meaning Cathode-ray tube meaning Catoptric light meaning Causeway meaning Cautionary or caution note meaning Cavitation meaning Cay also kay, key meaning Ceiling meaning Celestial body meaning Celestial concave meaning Celestial coordinates meaning Celestial equator meaning Celestial equator system of coordinates meaning Celestial globe meaning Celestial horizon meaning Celestial latitude meaning Celestial line of position meaning Celestial longitude meaning Celestial meridian meaning Celestial navigation meaning Celestial pole meaning Celestial sphere meaning Cellular wave meaning Celsius temperature scale meaning Centering or centring meaning Centigrade temperature scale meaning Centimetre-gram-second cgs system meaning Central meridian meaning Central processing unit cpu meaning Centre reduction to meaning Centre of buoyancy meaning Centre of gravity meaning Centrifugal force meaning Centripetal force meaning Centrosphere meaning Cesium clock meaning Cesium magnetometer meaning C-factor u.S.A. meaning Cgs system meaning Chain meaning Chaining meaning Chain adjustment meaning Chain of triangulation meaning Challenger meaning Change of tide meaning Channel meaning Channel frequency meaning Channel sea meaning Character meaning Characteristics of light meaning Character of light meaning Character or characteristics of the bottom meaning Chart meaning Chart aeronautical meaning Chart bathymetric meaning Chart blank meaning Chart coast or coastal meaning Chart cotidal meaning Chart current meaning Chart datum meaning Chart fair meaning Chart field meaning Chart fishery meaning Chart general meaning Chart gnomonic meaning Chart geophysical meaning Chart gravity anomaly meaning Chart great circle meaning Chart grid meaning Chart harbour meaning Chart hydrographic meaning Chart index meaning Chart layer depth meaning Chart magnetic meaning Chart marine meaning Chart mercator meaning Chart nautical meaning Chart new meaning Chart new edition meaning Chart original meaning Chart pilot meaning Chart polar meaning Chart provisional meaning Chart radar meaning Chart radionavigational meaning Chart route or routeing meaning Chart sailing meaning Chart sea bottom sediment meaning Chart star meaning Chart or map synoptic meaning Chart tidal current meaning Chart or map weather meaning Chart working meaning Chart amendment patch meaning Chart comparison unit meaning Chart compilation meaning Chart datum meaning Charted depth meaning Chart evaluation survey meaning Chartlet meaning Chart portfolio meaning Chart production meaning Chart projection meaning Chart reading meaning Chart scale meaning Chart sounding datum meaning Chart symbol meaning Check angle meaning Check lines of sounding meaning Chlorinity meaning Chlorophyll meaning Chlorosity meaning Choppy meaning Choppy sea meaning Chromatic aberration meaning Chromatism meaning Chromosphere meaning Chronograph meaning Chronometer meaning Chronometer sidereal meaning Chronometer standard meaning Chronometer correction meaning Chronometer rate meaning Chronometric method meaning Cinders meaning Circle meaning Circle dip meaning Circle fundamental meaning Circle great meaning Circle horizontal meaning Circle hydrographic meaning Circle small meaning Circle vertical meaning Circle of declination meaning Circle of equal altitude meaning Circle of latitude meaning Circle of position meaning Circle of right ascension meaning Circle of uncertainty meaning Circle of visibility meaning Circle sheet u.S meaning Circular fix meaning Circular level meaning Circular radiobeacon station meaning Circum-meridian altitude meaning Circumpolar meaning Cirrocumulus meaning Cirrostratus meaning Cirrus meaning Civil day meaning Civil time meaning Civil twilight meaning Civil year meaning Clamping error meaning Clamp or clamping screw meaning Clamshell snapper meaning Clapotis meaning Clarke's spheroid meaning Clay meaning Clean meaning Clear meaning Clearance meaning Clearance bridge meaning Clearance overhead pipeline meaning Clearance safe overhead meaning Cleared depth meaning Clearing meaning Clearing line meaning Clearing marks meaning Clear sweeping meaning Cliff meaning Climate meaning Climatology meaning Clinometer meaning Clock meaning Clock atomic meaning Clock cesium meaning Clock crystal meaning Clock quartz meaning Closed traverse meaning Close pack ice meaning Closing error meaning Closing line meaning Closing the horizon meaning Closure error of meaning Closure of triangle meaning Cloud meaning Cloud amount meaning Cloud classification meaning Cloud genera meaning Clutter meaning Coast meaning Coastal chart meaning Coastal current meaning Coastal refraction meaning Coastal survey meaning Coast chart meaning Coast guard station meaning Coastline meaning Coastlining meaning Coast pilot u.S.A. meaning Coastwise navigation meaning Coaxial cable meaning Cobble meaning Cocked hat meaning Cocurrent line meaning Code meaning Codeclination meaning Coding delay meaning Coefficient of refraction meaning Coelenterate meaning Coherent electromagnetic wave meaning Col meaning Colatitude meaning Cold front meaning Cold wave meaning Collector tracing meaning Collimation adjustment meaning Collimation axis meaning Collimation error meaning Collimator meaning Collimator auto meaning Collimator vertical meaning Colour of sea water meaning Colour proof meaning Colour plate meaning Colour separation meaning Colure equinoctial meaning Colure solsticial meaning Coma meaning Comb micrometer meaning Comber meaning Comet meaning Common or vulgar establishment meaning Compact pack ice meaning Compacted ice edge meaning Compacting meaning Comparator meaning Comparing watch meaning Compass meaning Compass astro meaning Compass boat meaning Compass box meaning Compass deadbeat meaning Compass dipping meaning Compass dry or dry card meaning Compass dumb meaning Compass gyroscopic meaning Compass hanging meaning Compass inverted meaning Compass liquid meaning Compass magnetic meaning Compass master meaning Compass master gyro meaning Compass overhead meaning Compass pocket meaning Compass sky meaning Compass spirit meaning Compass standard meaning Compass steering meaning Compass sun meaning Compass surveyor's meaning Compass trough meaning Compass tubular meaning Compass wet meaning Compass adjustment meaning Compass adjustment buoy meaning Compass bearing meaning Compass bowl meaning Compass calibration meaning Compass card meaning Compass compensation meaning Compass corrector meaning Compass course meaning Compasses pair of meaning Compass meridian meaning Compass needles meaning Compass north meaning Compass points meaning Compass repeater meaning Compass rose meaning Compensate meaning Compensating coils meaning Compensation depth meaning Compensation of magnetic compass meaning Compensator magnetic meaning Compilation meaning Compilation diagram meaning Compiler meaning Component meaning Composite electronic navigational system meaning Composite path meaning Composite photograph meaning Composite sailing meaning Compound tide meaning Compression of the earth meaning Compression ratios meaning Compressional wave meaning Computer meaning Computer analogue meaning Computer digital meaning Computer-assisted computer-aided cartography meaning Computer graphics meaning Concentration ice meaning Concluded angle meaning Condenser meaning Condition equation meaning Conductivity meaning Cone meaning Configuration of terrain meaning Confluence flowing together meaning Conformality meaning Conformal projection meaning Conic or conical projection meaning Conical buoy meaning Conical projections meaning Conjunction inferior meaning Conjunction superior meaning Connection geodetic meaning Console meaning Consolidated pack ice meaning Conspicuous meaning Constant deviation meaning Constant error meaning Constellation meaning Constituent meaning Constituent day meaning Contact glass meaning Contact plate meaning Contact print meaning Contiguous zone meaning Continent meaning Continental borderland meaning Continental margin meaning Continental rise meaning Continental or island shelf meaning Continental shelf limit meaning Continental or island slope meaning Continuous strip camera meaning Continuous wave meaning Contour or contour line meaning Contour depression meaning Contour depth meaning Contouring meaning Contour interval meaning Contour line meaning Contour map meaning Contour sweeping meaning Contrast meaning Control meaning Control astronomical meaning Control basic meaning Control geodetic meaning Control ground meaning Control horizontal meaning Control minor meaning Control photogrammetric meaning Control supplemental meaning Control vertical meaning Controlled mosaic meaning Controlling depth meaning Control mark meaning Control point meaning Control station meaning Convection meaning Convection forced meaning Convection free meaning Convergence meaning Convergence of the meridians meaning Convergence zone meaning Conversion meaning Conversion angle meaning Conversion factor meaning Conversion scale meaning Conversion table meaning Coordinate axes meaning Coordinated universal time utc meaning Coordinates meaning Coordinates celestial meaning Coordinates false meaning Coordinates geocentric meaning Coordinates geodetic meaning Coordinates geographical meaning Coordinates grid meaning Coordinates origin of meaning Coordinates photograph meaning Coordinates plane meaning Coordinates plane polar meaning Coordinates plane rectangular meaning Coordinates polar meaning Coordinates rectangular meaning Coordinates space meaning Coordinates spherical meaning Coordinates strip meaning Coordinate system meaning Coordinatograph meaning Coplane basal meaning Copper plate meaning Coral meaning Coral head meaning Coral reef meaning Co-range line meaning Cordillera meaning Core meaning Core barrel meaning Core catcher meaning Corer meaning Corer hydroplastic meaning Corer piston meaning Corer polyvinyl meaning Core sample meaning Coring instrument or device meaning Coring or core tube meaning Coriolis force meaning Corona meaning Corrected establishment meaning Correction meaning Correction atmospheric meaning Correction ionospheric meaning Correction relativistic meaning Correction sky-wave meaning Corrections tape meaning Correction of soundings meaning Corrector magnet meaning Correlate equation meaning Correlation meaning Cosmic dust meaning Cosmic radiation meaning Cotidal chart meaning Cotidal line meaning Coulomb meaning Counter meaning Counter current meaning Course meaning Course compass meaning Course great circle meaning Course grid meaning Course magnetic meaning Course recommended meaning Course true meaning Course line meaning Course made good meaning Course over ground meaning Course recorder meaning Cove meaning Coverage meaning Covariance meaning Covers and uncovers or discovers meaning Crab meaning Crack meaning Crag meaning Crater meaning Creek meaning Crescent meaning Crest meaning Crib meaning Critical sounding meaning Cross bearings meaning Cross hairs meaning Crossing angle meaning Crosslines meaning Cross lines of sounding meaning Cross sea meaning Cross section lines of soundings meaning Cross wind meaning Cross wires or hairs meaning Cruise line of sounding meaning Cruising radius or range meaning Crust meaning Crystal clock meaning Ctd probe meaning Culmination meaning Culture meaning Cumulonimbus meaning Cumulus meaning Cupola meaning Current meaning Current backrush meaning Current coastal meaning Current density meaning Current diurnal meaning Current drift meaning Current drift angle meaning Current earth meaning Current ebb meaning Current flood meaning Current geostrophic meaning Current gradient meaning Current mixed meaning Current nontidal meaning Current ocean/sea meaning Current periodic meaning Current permanent meaning Current rectilinear meaning Current residual meaning Current reversing meaning Current rip meaning Current rotary meaning Current seasonal meaning Current semidiurnal meaning Current stream meaning Current subsurface meaning Current surface meaning Current surge meaning Currents telluric meaning Current tidal meaning Current turbidity meaning Current wind driven meaning Current chart meaning Current cycle meaning Current difference meaning Current direction meaning Current line meaning Current meter meaning Current pole meaning Current station meaning Current tables meaning Cursor meaning Curvature correction meaning Curve depth meaning Customhouse meaning Cust protractor meaning Cut angle of meaning Cutter meaning Cycle meaning Cycle per second meaning Cycloidal wave meaning Cyclone meaning Cylindrical buoy meaning Cylindrical projection meaning Daily rate meaning Daily retardation meaning Dam meaning Damped waves meaning Damping meaning Dan buoy meaning Danger angle meaning Danger area meaning Danger bearing meaning Danger buoy meaning Danger line meaning Dangerous rock meaning Dangerous semicircle meaning Dangerous wreck meaning Danger sounding meaning Danger to navigation meaning Danger zone meaning Dark slide meaning Data meaning Data bank meaning Data base meaning Data base management system meaning Data processing meaning Data retrieval meaning Data set meaning Data telemetry meaning Date line meaning Datum meaning Datum chart meaning Datum geodetic meaning Datum levelling meaning Datum sounding meaning Datum tidal meaning Datum vertical control meaning Datum for heights meaning Datum for sounding meaning Datum for sounding reduction meaning Datum level meaning Datum line meaning Datum of tide predictions meaning Datum plane meaning Datum point meaning Day meaning Day apparent solar meaning Day astronomical meaning Day civil meaning Day constituent meaning Day lunar meaning Day mean solar meaning Day sidereal meaning Day solar meaning Day tidal meaning Daybeacon an unlighted beacon meaning Daylight saving time meaning Daymark meaning Day number meaning Dead ahead meaning Dead astern bearing 180°relative meaning Deadbeat meaning Deadbeat compass meaning Deadhead meaning Dead reckoning meaning Dead reckoning position meaning Dead reckoning tracer meaning Dead reckoning track meaning Dead water meaning Debris meaning Deceleration meaning Decibar meaning Decibel meaning Decimetre meaning Declination meaning Declination grid meaning Declination magnetic meaning Declinational inequality meaning Declination circle meaning Declinatoire meaning Declinometer meaning Declivity meaning Deep meaning Deep-draught route meaning Deep ocean floor meaning Deep scattering layer dsl meaning Deep-sea camera meaning Deep-sea lead meaning Deep-sea thermometer meaning Deep water route meaning Defile meaning Definition meaning Deflection of the plumb line meaning Deflection of the vertical meaning Deflector meaning Degaussing meaning Degaussing cable meaning Degree meaning Delambre's spheroid meaning Delimitation meaning Delineation meaning Delta meaning Demagnetize meaning Densitometer meaning Density meaning Density layer meaning Density of soundings meaning Departure meaning Departure point of meaning Deposit meaning Depressed pole meaning Depressor meaning Depression meaning Depression angle of meaning Depression contour meaning Depression of the horizon meaning Depth meaning Depth charted meaning Depth compensation meaning Depth controlling meaning Depth standard meaning Depth thermometric meaning Depth anomaly graph meaning Depth contour meaning Depth curve meaning Depth differences meaning Depth finder meaning Depth gauge meaning Depth ice meaning Depth of the sea meaning Derelict meaning Derrick meaning Descending node meaning Detached position meaning Detached sounding meaning Details meaning Detection threshold meaning Detritus meaning Deviation meaning Deviation constant meaning Deviation magnetic meaning Deviation quadrantal meaning Deviation residual meaning Deviation semicircular meaning Deviation standard meaning Deviation of the vertical meaning Deviation table meaning Dew meaning Dew-point meaning Diagenesis meaning Diagram meaning Dial meaning Diaphone meaning Diaphragm meaning Diapositive meaning Difference tidal meaning Difference of latitude meaning Difference of longitude meaning Differential gps meaning Differential levelling meaning Differential mode meaning Differential shrinkage meaning Diffraction meaning Digital meaning Digital chart meaning Digital computer meaning Digital imagery processing system meaning Digital terrain model dtm meaning Digitization or digitisation meaning Digitizer meaning Dike or dyke meaning Dilution of precision dop meaning Diopter meaning Dioptric light meaning Dip meaning Dip circle meaning Dip correction meaning Dip or dipping needle meaning Dip of a sea horizon meaning Dip of the horizon meaning Dipping compass meaning Dipsey lead meaning Direction meaning Direction base meaning Direction grid meaning Directional antenna meaning Directional gyroscope meaning Directional or directed radiobeacon station meaning Direction finder meaning Direction or directional light meaning Direction method of observation meaning Direction of current meaning Direction of gravity meaning Direction of movement of the waves meaning Direction of relative movement meaning Direction of the force of gravity meaning Direction of tilt meaning Direction of traffic flow established meaning Direction of traffic flow recommended meaning Direction of wind meaning Direction theodolite meaning Direct levelling meaning Direct wave meaning Disc u.S meaning Discoloured water meaning Discontinuity layer meaning Discrepancy meaning Discrepancy in position meaning Discriminator meaning Dish aerial meaning Dispersion meaning Displacement meaning Displacement drafts meaning Display meaning Distance finding station meaning Distance measuring equipment dme meaning Distance reduction meaning Distortion meaning Distortion angular meaning Distortion lens meaning Distortion radial meaning Distortion of medium meaning Distributary meaning Diurnal aberration meaning Diurnal arc meaning Diurnal current meaning Diurnal inequality meaning Diurnal motion meaning Diurnal parallax meaning Diurnal range meaning Diurnal tide meaning Diver meaning Divergence meaning Dividers meaning Dock meaning Dock dry meaning Dock floating meaning Dock graving meaning Dock wet meaning Dock sill meaning Dog leg meaning Doldrums meaning Dolphin meaning Dolphin beacon meaning Doppler effect meaning Doppler navigation meaning Double high water meaning Double low water meaning Double meridian distance meaning Double tide meaning Double zenith distance meaning Doubtful sounding meaning Dove prism meaning Down meaning Downstream meaning Downwind meaning Dracontic month meaning Draft or draught meaning Draft aft meaning Drafted original meaning Draft forward meaning Drafting meaning Draft marks meaning Draftsman or draughtsman meaning Drag meaning Drag of theodolite meaning Draught meaning Draughtsman meaning Drawing meaning Dredge meaning Dredged area meaning Dredger meaning Dredging buoy meaning Dries' meaning Drift meaning Drift angle meaning Drift bottle meaning Drift buoy meaning Drift current meaning Drift ice foot meaning Drifting logship meaning Drift lead meaning Drift sounding meaning Drift station meaning Driver rod meaning Driver tube meaning Drizzle meaning Drogue meaning Drum meaning Drum plotter meaning Dry bulb thermometer meaning Dry or dry card compass meaning Dry dock meaning Drying heights meaning Drying line meaning Drying reef meaning Dry proof meaning Duck blinds meaning Duct meaning Due publicity meaning Dumb compass meaning Dumping ground meaning Dumpy level meaning Dune meaning Duplex meaning Duplexer meaning Duration of fall meaning Duration of flood and duration of ebb meaning Duration of rise and duration of fall meaning Duration of tide meaning Dust meaning Duststorm meaning Dutchman's log meaning Dx90-format meaning Dyke meaning Dynameter meaning Dynamic positioning meaning Dynamometer meaning Dyne meaning Eagre or eager meaning Earth meaning Earth current meaning Earth inductor meaning Earth light meaning Earthquake meaning Earth's crust meaning Earth's magnetic field meaning Earth's mantle meaning Earthshine meaning Earth tide meaning Easting meaning Ebb the ebb stream meaning Ebb current meaning Ebb interval meaning Ebb stream meaning Ebb strength meaning Ebb tide meaning Eccentric angle meaning Eccentricity meaning Eccentricity of alidade meaning Eccentricity of circle meaning Eccentricity of ellipse meaning Eccentricity of instrument meaning Eccentric reduction meaning Eccentric signal meaning Eccentric station meaning Echo meaning Echoes false meaning Echoes multiple meaning Echoes side meaning Echogram meaning Echometer france meaning Echo ranging meaning Echoscope france meaning Echo sounder meaning Echo sounding meaning Echo sounding instrument or apparatus meaning Eclipse meaning Eclipse annular meaning Eclipse lunar meaning Eclipse partial meaning Eclipse solar meaning Eclipse total meaning Ecliptic meaning Ecliptic latitude meaning Ecliptic system of coordinates meaning Ecology meaning Eddy meaning Eddy viscosity meaning Edge meaning Edge wave meaning Eelgrass meaning Ekman bottle meaning Ekman current meter meaning Ekman spiral meaning Elbow meaning Electric log meaning Electric submerged log meaning Electromagnetic distance measurement edm meaning Electromagnetic log meaning Electromagnetic position fixing meaning Electromagnetic wave meaning Electrometeor meaning Electronic chart meaning Electronic chart display and information system ecdis meaning Electronic data processing meaning Electronic distance-measuring equipment edm meaning Electronic line of position meaning Electronic navigation meaning Electronic navigation station meaning Electronic navigational chart enc meaning Electronic plotting sheet meaning Electronic telemeter meaning Electro-optical distance measurement eodm meaning Electrostriction meaning Electrotape meaning Elevated pole meaning Elevation meaning Elevation angle of meaning Elevation barometric meaning Elevation of sight meaning Elevation tints meaning Ellipse meaning Ellipsoid of reference meaning Ellipsoid of revolution or rotation meaning Ellipticity of an ellipse meaning Ellipticity of the spheroid meaning Elongation meaning Embankment meaning Embayment meaning Emergent nodal point meaning Emulsion meaning Enamelled plate meaning Enclosed sea meaning End lap meaning Energy radiant meaning Engraving meaning Entrance meaning Entrance pupil meaning Entrance window meaning Envelope meaning Envelope edge meaning Environment meaning Eotvos balance meaning Eotvos correction meaning Eotvos effect meaning Epact of the year meaning Ephemeris meaning Epicentre or epicenter, epicentrum meaning Epipolar plane meaning Epipolar ray meaning Epipoles meaning Epoch meaning Equal altitudes meaning meaning Equation condition meaning Equation correlate meaning Equation error meaning Equation laplace meaning Equation normal meaning Equation observation meaning Equation personal meaning Equation method meaning Equation of time meaning Equator meaning Equator astronomical meaning Equator celestial meaning Equator geodetic meaning Equator heat meaning Equator magnetic meaning Equator terrestrial meaning Equator thermal meaning Equatorial calms meaning Equatorial horizontal parallax meaning Equatorial tides meaning Equidistance line meaning Equilibrium meaning Equilibrium argument meaning Equilibrium tide meaning Equinoctial meaning Equinoctial colure meaning Equinoctial point meaning Equinoctial spring tides meaning Equinoctial system of coordinates meaning Equinoctial year meaning Equinox meaning Equinoxes precession of meaning Equiphase zone meaning Equipotential surface meaning Equisignal zone meaning Equivalent focal length meaning Equivalent projection meaning Equivalent scale meaning Era meaning Erect image meaning Erecting eyepiece meaning Erg meaning Erosion meaning Error meaning Error absolute meaning Error accidental meaning Error clamping meaning Error closing meaning Error constant meaning Error external meaning Error gaussin meaning Error gross meaning Error heeling meaning Error index meaning Error instrumental meaning Error irregular meaning Error mean square meaning Error parallactic meaning Error periodic meaning Error personal meaning Error polarization meaning Error probable meaning Error random meaning Error regular meaning Error residual meaning Error root mean square meaning Error sextant meaning Error standard meaning Error station meaning Error swirl meaning Error systematic meaning Error theoretical meaning Error equation meaning Error of closure meaning Error of closure of horizon meaning Error of closure of triangle meaning Error of collimation meaning Error of graduation meaning Error of magnetic compass meaning Error of run micrometer meaning Escarpment meaning Establishment meaning Establishment of the port meaning Estimated position ep meaning Estuary meaning Estimated time of arrival eta meaning Estimated time of departure etd meaning Etch meaning Eulerian current observations meaning European datum meaning Evaluation report meaning Evaporimeter meaning Evection meaning Everest spheroid meaning Exercise area meaning Exclusive economic zone meaning Existence doubtful meaning Exit pupil meaning Exit window meaning Ex-meridian altitude meaning Expansion factor meaning Expert system meaning Exploration drilling meaning Exploratory survey meaning Explosive anchorage area meaning Explosive fog signal meaning Exposure meaning Exposure interval meaning Exposure station meaning Exposure time meaning Exterior orientation meaning Exterior perspective centre meaning External error meaning Extinction coefficient meaning Extrapolation meaning Extremely high frequency ehf meaning Extrusion meaning Eye base meaning Eye of the storm meaning Eyepiece meaning Eyepiece erecting meaning Eyepiece micrometer meaning Faces of theodolite meaning Facility navigational meaning Facility port meaning Facsimile meaning Fading meaning Fahrenheit temperature scale meaning Fair chart british terminology meaning Fair sheet meaning Fair tracing british terminology meaning Fairway meaning Fairway buoy meaning Falling tide meaning False bottom meaning False coordinates meaning False echo meaning False horizon meaning False origin meaning False station meaning False target meaning Fan meaning Farad meaning Farewell buoy meaning Fast ice meaning Fata morgana meaning Fathogram meaning Fathom meaning Fathom curve meaning Fathom line meaning Fault meaning Faye anomaly meaning Feature code meaning Fender meaning Fetch meaning Fiducial axes meaning Fiducial marks meaning Field board british terminology meaning Field chart meaning Field examination meaning Field inspection meaning Field position meaning Field sheet meaning Field stop meaning Field work meaning Figure of the earth meaning File meaning Filter meaning Filtering meaning Final great circle course meaning Fiord or fjord meaning Firn meaning First nodal point meaning First order triangulation meaning First point of aries meaning First point of cancer meaning First point of capricorn meaning First point of libra meaning First quarter meaning Firth meaning Fish aggregating device fad meaning Fishery conservation zone meaning Fish farm meaning Fish haven meaning Fishing area meaning Fishing ground meaning Fishing reef meaning Fishing zone meaning Fish lead meaning Fish or fishing stakes meaning Fish trap or weir meaning Fish trap buoy meaning Fish weir meaning Fix meaning Fix circular meaning Fix running meaning Fix split meaning Fix three-point meaning Fixed angle plot british terminology meaning Fixed angle sounding meaning Fixed platform meaning Fixed star meaning Fixed station meaning Fixing meaning Fixing interval meaning Fjord meaning Flare stack meaning Flare triangulation meaning Flat meaning Flat-bed plotter meaning Flattening of the earth meaning Flight altitude meaning Flight strip meaning Flinders bar meaning Float meaning Float gauge meaning Floating breakwater meaning Floating dock meaning Floating ice meaning Floating mark meaning Floating point meaning Floating triangulation meaning Float-off british terminology meaning Float well meaning Floe or ice floe meaning Flood meaning Flood current meaning Flood stream meaning Flood tide meaning Flotsam meaning Flow meaning Flume meaning Fluorescence meaning Flux luminous meaning Flux radiant meaning Flux-gate magnetometer meaning F-number meaning Foam line meaning Focal distance meaning Focal length meaning Focal length calibrated meaning Focal length equivalent meaning Focal plane meaning Focal-plane plate meaning Focal-plane shutter meaning Focal point meaning Focus pl meaning Focus meaning Fog meaning Fog advection meaning Fog ice meaning Fog sea meaning Fog wet meaning Fog bank meaning Fog bell meaning Fog detector light meaning Fog gong meaning Fog gun meaning Fog horn meaning Fog patches meaning Fog signal meaning Fog signal explosive meaning Fog signal radio meaning Fog siren meaning Fog trumpet meaning Fog whistle meaning Following sea meaning Following wind meaning Font meaning Food and agricultural organization fao meaning Foot pl meaning Foot of the continental slope meaning Footscrew meaning Forced convection meaning Forced wave meaning Foreland meaning Forel scale meaning Foreshore meaning Foresight meaning Format meaning Formation sounding meaning Form lines meaning Forward azimuth meaning Forward lap meaning Foul 1 meaning Foul area meaning Foul berth meaning Foul bottom meaning Foul ground meaning Fouling meaning Fractional scale meaning Fracture zone meaning Frazil ice meaning Free-air anomaly meaning Free atmosphere meaning Free convection meaning Free gyroscope meaning Free port meaning Free wave meaning Freezing meaning Freezing point meaning Frequency meaning Frequency extremely high ehf meaning Frequency high hf meaning Frequency low lf meaning Frequency medium mf meaning Frequency natural meaning Frequency radio meaning Frequency resonant meaning Frequency super high shf meaning Frequency ultra high uhf meaning Frequency very high vhf meaning Frequency very low vlf meaning Frequency band meaning Frequency channel meaning Frequency modulation meaning Frequency of soundings meaning Freshet meaning Friction layer meaning Fringing reef meaning Front meaning Frontal surface meaning Front light meaning Front nodal point meaning Frost or freezing meaning Frost point meaning Frost smoke meaning F-stop meaning Fucus meaning Full moon meaning Function key meaning Fundamental circle meaning Furrow meaning Fusion stereoscopic meaning Gage meaning Gain meaning Gal derived from galileo meaning Gale meaning Gale warning meaning Galton's sun signal meaning Galvanometer meaning Galvanoplasty or galvanoplastics meaning Gamma meaning Gamma ray meaning Gap meaning Gas chromatography meaning Gas field meaning Gat meaning Gate hydraulic meaning Gauge meaning Gauge depth meaning Gauge float meaning Gauge pressure meaning Gauge rain meaning Gauge tide meaning Gauss meaning Gaussin error meaning Gelbstoff meaning General bathymetric chart of the oceans gebco meaning General chart meaning General notices meaning Generalisation meaning Geocentric coordinates meaning Geocentric latitude meaning Geocentric parallax meaning Geodesic meaning Geodesic line meaning Geodesy meaning Geodesy satellite meaning Geodetic azimuth meaning Geodetic connection meaning Geodetic control meaning Geodetic coordinates meaning Geodetic data meaning Geodetic datum meaning Geodetic equator meaning Geodetic latitude meaning Geodetic levelling meaning Geodetic line meaning Geodetic longitude meaning Geodetic meridian meaning Geodetic parallel meaning Geodetic position meaning Geodetic survey meaning Geographical coordinates meaning Geographic information system meaning Geographical latitude meaning Geographical longitude meaning Geographical meridian meaning Geographical parallel meaning Geographical pole meaning Geographical position meaning Geographical range meaning Geoid meaning Geological survey meaning Geological time meaning Geology meaning Geology submarine meaning Geomagnetic field meaning Geomagnetism meaning Geomatics meaning Geometric dilution of precision meaning Geometric latitude meaning Geometric projection meaning Geomorphology meaning Geophysics meaning Geosphere meaning Geostationary satellite meaning Geostrophic wind meaning Gibbous meaning Gimbals meaning Glacier meaning Glacier ice meaning Glacier tongue meaning Glaciology meaning Glen meaning Glitter meaning Global positioning system gps meaning Global maritime distress and safety system gmdss meaning Globe meaning Gnomon meaning Gnomonic chart meaning Gnomonic projection meaning Gold slide meaning Gong buoy meaning Goniometer meaning Gorge meaning Grab meaning Grab sampling meaning Grad or grade meaning Grade meaning Grade correction tape meaning Gradient meaning Gradient tints meaning Graduation meaning Graduation error meaning Gramme meaning Granite meaning Graphic control survey meaning Graphic scale meaning Graticule meaning Graticule adjustment meaning Gravel meaning Gravimeter meaning Gravimetric survey meaning Graving dock meaning Gravitation meaning Gravity meaning Gravity centre of meaning Gravity direction of meaning Gravity intensity of meaning Gravity anomaly meaning Gravity anomaly chart meaning Gravity coring meaning Gravity meter meaning Gravity wave meaning Grease ice meaning Great circle meaning Great circle primary meaning Great circle bearing meaning Great circle chart meaning Great circle course meaning Great circle sailing meaning Great circle track meaning Great diurnal range meaning Greatest elongation meaning Great tropic range meaning Greenwich civil time meaning Greenwich hour angle meaning Greenwich mean time gmt meaning Greenwich meridian meaning Greenwich time meaning Grid meaning Grid parallactic meaning Grid perspective meaning Grid universal transverse mercator utm meaning Grid azimuth meaning Grid bearing meaning Grid coordinates meaning Grid course meaning Grid declination meaning Grid direction meaning Gridiron meaning Grid magnetic angle meaning Grid meridian meaning Grid method meaning Grid navigation meaning Grid north meaning Grid ticks meaning Grid variation meaning Grivation meaning Groin or groyne meaning Gross error meaning Ground meaning Ground and i. meaning Ground control meaning Ground control point meaning Ground distance meaning Ground effects meaning Ground ice meaning Ground layer meaning Ground log meaning Ground nadir meaning Ground parallel meaning Ground photograph meaning Ground plane meaning Ground range meaning Ground resolution meaning Ground speed meaning Ground survey meaning Ground swell meaning Ground truth meaning Ground wave meaning Group meaning Group velocity meaning Growler meaning Guard lock meaning Guidance meaning Gulf meaning Gully meaning Gust meaning Gut meaning Guyot meaning Gyre meaning Gyro meaning Gyro free meaning Gyro compass meaning Gyro pilot meaning Gyro repeater meaning Gyroscope meaning Gyroscope directional meaning Gyroscope free meaning Gyroscopic compass meaning Gyroscopic inertia meaning Gyroscopic stabilization meaning Gyro sextant meaning Hachures meaning Hack watch meaning Hail meaning Hailstone meaning Halation meaning Half byte meaning Half convergency meaning Half tide meaning Half tide level meaning Halftone meaning Halo solar, lunar meaning Halo large halo of 46o meaning Halo small halo of 22o meaning Halocline meaning Hand lead meaning Hand lead sounding meaning Hanging compass meaning Hanging traverse meaning Harbour or harbor meaning Harbour inner meaning Harbour island meaning Harbour outer meaning Harbour tidal meaning Harbour chart meaning Harbour line meaning Harbour master meaning Harbour reach meaning Harbour works meaning Hard bottom meaning Hard iron meaning Hardware meaning Harmonic meaning Harmonic analysis of tide meaning Harmonic constants meaning Harmonic constituent meaning Harmonic prediction meaning Hatching meaning Haven meaning Hayford's spheroid meaning Hazard beacon meaning Haze meaning Head meaning Heading meaning Headland meaning Head sea meaning Headwaters meaning Headway meaning Head wind meaning Heat equator meaning Heat lightning meaning Heat wave meaning Heave meaning Heave compensation meaning Heavenly body meaning Heel meaning Heeling error meaning Heeling magnet meaning Height meaning Height finder meaning Height of cloud base meaning Height of eye correction meaning Height of tide meaning Heliocentric parallax meaning Heliograph meaning Heliostat meaning Heliotrope meaning Heli pad meaning Helium magnetometer meaning Helmert spheroid meaning Hemispherical map meaning Henry meaning Hertz meaning Hertzian waves meaning High meaning Higher high water h.H.W. meaning Higher high water interval meaning Higher low water h.L.W. meaning Higher low water interval meaning Highest astronomical tide meaning High frequency hf meaning Highland or highlands meaning High noon meaning High oblique photograph meaning High seas meaning High tide meaning High water h.W. meaning High water double meaning High water storm meaning High water full and change h.W.F meaning High water inequality meaning High water interval meaning High water line meaning High water lunitidal interval h.W.I. meaning High water mark meaning High water quadrature h.W.Q. meaning High water stand meaning Hill meaning Hillock meaning Hill shading meaning Hinterland meaning Historic bay meaning Hoarfrost meaning Hodograph meaning Hodometer meaning Holding ground meaning Hole meaning Holiday meaning Hollow meaning Homing meaning Hook meaning Horizon meaning Horizon apparent meaning Horizon artificial meaning Horizon celestial meaning Horizon closing the meaning Horizon dip of the meaning Horizon false meaning Horizon radio meaning Horizon rational meaning Horizon sensible meaning Horizon true meaning Horizon visible or local meaning Horizon glass meaning Horizon line meaning Horizon mirror meaning Horizon photograph meaning Horizon shade meaning Horizon system of coordinates meaning Horizontal adj meaning Horizontal axis meaning Horizontal circle meaning Horizontal control meaning Horizontal control datum meaning Horizontal coplane meaning Horizontal dilution of precision hdop meaning Horizontal force instrument meaning Horizontal intensity of the earth's magnetic field meaning Horizontal parallax meaning Horizontal photograph meaning Horizontal plane meaning Horizon trace meaning Horn meaning Horn buoy meaning Hour meaning Hour angle meaning Hour circle meaning Hulk meaning Humidity meaning Humidity of the air meaning Hummock meaning Hummocked ice meaning Hummocking meaning Hunter short base apparatus meaning Hunting meaning Hurricane meaning Hurricane warning meaning Hydrograph meaning Hydrographer meaning Hydrographic airborne laser sounder meaning Hydrographic chart meaning Hydrographic circle meaning Hydrographic data acquisition meaning Hydrographic data processing system meaning Hydrographic datum meaning Hydrographic sextant meaning Hydrographic signal meaning Hydrographic survey meaning Hydrographic survey examination meaning Hydrographic survey sheet meaning Hydrography meaning Hydrologic front meaning Hydrologic series meaning Hydrology meaning Hydrometeor meaning Hydrometer meaning Hydrophone meaning Hydrophone streamer meaning Hydrophotometer meaning Hydroplastic corer meaning Hydrosphere meaning Hydrostatic instability meaning Hydrostatic levelling meaning Hydrostatic pressure meaning Hydrostatic stability meaning Hygrograph meaning Hygrometer meaning Hygrothermograph meaning Hyperbola meaning Hyperbolic line of position meaning Hyperbolic navigation meaning Hyperbolic numbers meaning Hyperbolic system meaning Hypsograph meaning Hypsographic or hypsometric curve meaning Hypsometer meaning Hypsometric curve meaning Hypsometric tints meaning Hypsometry meaning Hysteresis meaning Ice meaning Iceberg meaning Ice blink meaning Icebound meaning Ice cake meaning Ice cap meaning Ice cluster meaning Ice concentration meaning Ice cover meaning Ice edge meaning Ice field meaning Ice floe meaning Ice fog meaning Icefoot meaning Ice free meaning Ice front meaning Ice island meaning Ice limit meaning Ice piedmont meaning Ice rind meaning Ice rise meaning Ice sheet meaning Ice shelf meaning Ice storm meaning Ice wall meaning Identification beacon meaning Igneous rock meaning Illuminated contours meaning Illuminated relief meaning Illumination at a point of a surface meaning Image meaning Image erect meaning Image inverted meaning Image real meaning Image virtual meaning Image point meaning Imagery meaning Impedance meaning Impersonal micrometer meaning Impulse meaning Inch meaning Incidence angle of meaning Incident nodal point meaning Incineration areas at sea meaning Inclination meaning Inclination magnetic meaning Inclination of the horizontal axis meaning Inclinometer meaning Indelta meaning Indentation meaning Index arm meaning Index bar meaning Index chart meaning Index contours meaning Index correction meaning Index error meaning Index glass meaning Index mark meaning Index map meaning Index mirror meaning Index of refraction meaning Index shade meaning Indian spring low water meaning Indian tide plane meaning Indicator meaning Indirect levelling meaning Indirect wave meaning Induced magnetism meaning Inequality meaning Inertia gyroscopic meaning Inertial navigation meaning Inferior conjunction meaning Inferior mirage meaning Inferior planet s meaning Inferior transit meaning Infrared meaning Infrasonic meaning Ingoing stream meaning Initial great circle course meaning Initial great circle direction meaning Initial meridian meaning Initial point meaning Inland ice sheet meaning Inlet meaning Inner harbour meaning Inner neat line meaning Innocent passage meaning Inogen light meaning Input meaning Input impedance meaning Inset meaning Inshore meaning Inshore traffic zone meaning Insolation meaning Instability meaning Instability static meaning Installation offshore meaning Instrumental or instrument correction meaning Instrumental or instrument error meaning Instrumental or instrument parallax meaning Insular meaning Insular shelf meaning Insulated or insulating water bottle meaning Intake meaning Intended track meaning Intensity luminous in a direction meaning Intensity magnetic meaning Intensity sound meaning Intensity of gravity meaning Intensity of magnetization meaning Intercardinal point meaning Intercept meaning Intercept method meaning Interface meaning Interference meaning Intergovernmental oceanographic commission ioc meaning Interior orientation meaning Interior perspective centre meaning Interlines of sounding meaning Internal waters meaning Internal wave meaning International association for the physical sciences of the ocean iapso meaning International association of geodesy iag meaning International waters meaning Interocular distance meaning Interpolation meaning Interpupillary distance meaning Interrogator meaning Interrogator-responsor meaning Intersected point meaning Intersection meaning Intersection station meaning Intertidal zone meaning Intertropical convergence zone meaning Intervalometer meaning Invar meaning Invar tape meaning Invar wire meaning Inverse mercator projection meaning Inversion layer meaning Inverted compass meaning Inverted image meaning Inverting eyepiece meaning Ionosphere meaning Ionospheric disturbance meaning Ionospheric storm meaning Ionospheric wave meaning Ironbound meaning Irradiance at a point of a surface meaning Irradiation at a point of a surface meaning Irregular error meaning Island meaning Island harbour meaning Island shelf meaning Island slope meaning Isle meaning Islet meaning Isobar meaning Isobath meaning Isobathytherm meaning Isobront meaning Isocentre meaning Isoclinal or isoclinic meaning Isoclinal meaning Isoclinal or isoclinic line meaning Isodynamic meaning Isodynamic line meaning Isogon meaning Isogonal or isogonic meaning Isogonic line meaning Isogram meaning Isogriv meaning Isohaline or isohalsine meaning Isohalsine meaning Isolated danger mark meaning Isoline meaning Isomagnetic meaning Isomagnetic line meaning Isometric meaning Isometric latitude meaning Isometric parallel meaning Isopleth meaning Isopor meaning Isoporic line meaning Isopycnic meaning Isopycnic line meaning Isoradial meaning Isostasy meaning Isostatic anomaly meaning Isotherm meaning Isothermal or isothermic meaning Isotope meaning Isotropic or isotropus meaning Isthmus meaning Jack-up rig meaning Jellyfish meaning Jetsam meaning Jettison meaning Jetty meaning Joule meaning Joystick meaning Julian day meaning Junction meaning Junction buoy meaning Kalman filter meaning Katabatic wind meaning Kay meaning Kedging meaning Keg buoy meaning Kelp meaning Kelvin temperature scale meaning Kelvin wave meaning Key meaning Kilogramme meaning Kite meaning Kite otter meaning Klaxon meaning Knoll meaning Knot meaning Kymatology meaning Labour or labor meaning Lag meaning Lagging of the tides meaning Lagan meaning Lagging of the tides meaning Lagoon meaning Lagrangian current observations meaning Lake meaning Lake breeze meaning Lake ice meaning Lambert conformal conic projection meaning Laminar flow meaning Lamp signal meaning Land meaning Land breeze meaning Landfall meaning Landfall buoy meaning Land ice meaning Landing meaning Landing area meaning Landlocked meaning Landmark meaning Land mile meaning Land navigation meaning Landslide or landslip meaning Land survey meaning Land territory meaning Lane meaning Laplace azimuth meaning Laplace equation meaning Laplace station meaning Lappened ice meaning Large correction british terminology meaning Large halo meaning Large automatic navigation buoy lanby meaning Large scale meaning Large scale survey meaning Lash meaning Laser meaning Last quarter meaning Lateral system meaning Latitude meaning Latitude astronomical meaning Latitude celestial meaning Latitude geocentric meaning Latitude geodetic meaning Latitude geographical meaning Latitude geometric meaning Latitude isometric meaning Latitude magnetic meaning Latitude parametric meaning Latitude reduced meaning Latitude terrestrial meaning Latitude factor meaning Latitude line meaning Latitude scale meaning Lattice meaning Launch meaning Lava meaning Layer meaning Layer depth meaning Layer depth prediction meaning Layering meaning Layer of no motion meaning Layer tinting meaning Lead lèd meaning Lead led meaning Lead deep sea meaning Lead drift meaning Lead fish meaning Lead hand meaning Lead sounding meaning Leader cable meaning Leading lights meaning Leading line british terminology meaning Leading marks meaning Lead line meaning Lead line correction meaning Leadsman meaning League meaning Leaper meaning Leap year meaning Least count meaning Least depth meaning Least squares meaning Ledge meaning Lee meaning Lee shore meaning Lee tide meaning Leeward meaning Leeward tidal current meaning Leeward tide meaning Leeway meaning Leeway angle meaning Left bank meaning Left-right indicator meaning Leg meaning Legend meaning Length correction tape meaning Lens meaning Lens axis meaning Lens distortion meaning Lens element meaning Lens system meaning Levee meaning Level meaning Level bull's eye meaning Level circular meaning Level dumpy meaning Level plate meaning Level self aligning meaning Level spirit meaning Level striding meaning Level tilting meaning Level universal meaning Level y meaning Level axis meaning Level ice meaning Levelling or leveling meaning Levelling barometric meaning Levelling direct meaning Levelling geodetic meaning Levelling indirect meaning Levelling reciprocal meaning Levelling spirit meaning Levelling thermometric meaning Levelling trigonometric meaning Levelling water meaning Levelling instrument meaning Levelling instrument dumpy level meaning Levelling instrument self-aligning level meaning Levelling instrument tilting level meaning Levelling instrument y level meaning Levelling plate meaning Levelling rod meaning Levelling screw meaning Levelling staff meaning Level net meaning Level surface meaning Librations of moon meaning Lidar meaning Life buoy meaning Life saving station meaning Light meaning Light aerial obstruction meaning Light aeromarine meaning Light aeronautical ground meaning Light alternating meaning Lights boundary meaning Light catoptric meaning Light composite group-flashing meaning Light composite group-occulting meaning Light continuous ultra quick meaning Light continuous very quick meaning Light dioptric meaning Light direction or directional meaning Light equal-interval meaning Light fixed meaning Light fixed and flashing meaning Light fixed and group-flashing meaning Light flashing meaning Light front meaning Light group-flashing meaning Light group-occulting meaning Light group quick meaning Light group very quick meaning Light intermittent meaning Light interrupted quick-flashing meaning Light interrupted ultra quick meaning Light interrupted very quick meaning Light isophase meaning Lights leading meaning Light linear meaning Light long-flashing meaning Light marine meaning Light morse code meaning Light obstruction meaning Light occasional meaning Light occulting meaning Light point meaning Light quick-flashing meaning Lights range meaning Light rear meaning Light revolving meaning Light rhythmic meaning Light rotating or revolving meaning Lights runway meaning Light sector or sectored meaning Light short-flashing meaning Lights tidal meaning Light undulating meaning Light unwatched meaning Lights vertical meaning Light or lighted beacon meaning Light beam meaning Light or lighted buoy meaning Light characteristics meaning Lighted sound buoy meaning Light float meaning Lighthouse meaning Light list meaning Lightning meaning Light pencil meaning Light ray meaning Light sector meaning Lightship meaning Light vessel meaning Light-year meaning Lighter aboard ship lash meaning Limb meaning Limestone meaning Limnology meaning Linear light meaning Linear parallax meaning Linear scale meaning Linear speed meaning Line of apsides meaning Line of collimation meaning Line of constant scale meaning Line of delimitation meaning Line of equidistance meaning Line of flow meaning Line of force meaning Line of levels meaning Line of nodes meaning Line of position meaning Line of sight meaning Line of sounding meaning Line spacing meaning Line squall meaning Lipper meaning Liquid compass meaning List meaning List of lights meaning List of radio signals meaning Lithification meaning Lithographic image meaning Lithographic transfer meaning Lithography meaning Lithology meaning Lithosphere meaning Litre or liter meaning Littoral meaning Local apparent noon meaning Local apparent time meaning Local attraction meaning Local frequency oscillator meaning Local horizon meaning Local hour angle meaning Localizer meaning Local magnetic disturbance meaning Local mean time meaning Local meridian meaning Local sidereal time meaning Local time meaning Local transit meaning Loch meaning Lock meaning Lock gates meaning Locking meaning Locus pl meaning Log meaning Log chip meaning Log dutchman's meaning Log electric meaning Log electric submerged meaning Log electromagnetic meaning Log ground meaning Log patent meaning Log taffrail meaning Logarithmic scale meaning Log book meaning Log boom meaning Log chip meaning Log factor meaning Log factor scale meaning Logging meaning Log line meaning Log ship meaning Long baseline acoustic system meaning Longitude meaning Longitude astronomical meaning Longitude celestial meaning Longitude geodetic meaning Longitude geographical meaning Longitude terrestrial meaning Longitude factor meaning Longitude line meaning Longitude signal meaning Longitudinal wave meaning Long range navigation meaning Longshore current meaning Lookout station meaning Lookout tower meaning Loom meaning Looming meaning Loop meaning Loop antenna meaning Lost' station meaning Lough meaning Louver shutter meaning Love wave or q-wave meaning Low meaning Lower branch meaning Lower culmination meaning Lower high water l.H.W. meaning Lower high water interval meaning Lower limb meaning Lower low water l.L.W. meaning Lower low water interval meaning Lower transit meaning Lowest astronomical tide meaning Lowest low water meaning Low frequency lf meaning Lowland meaning Low oblique photograph meaning Low tide meaning Low-tide elevation meaning Low velocity layer meaning Low water l.W. meaning Low water double meaning Low water full and change l.W.F meaning Low water inequality meaning Low water interval meaning Low water line meaning Low water lunitidal interval l.W.I. meaning Low water mark meaning Low water quadrature l.W.Q. meaning Low water stand meaning Loxodrome meaning Loxodromic curve meaning Lubber or lubber's line meaning Lull meaning Lumen meaning Luminance at a point of surface, in a direction meaning Luminescence meaning Luminous flux meaning Luminous intensity meaning Luminous range meaning Luminous signal meaning Lunar day meaning Lunar distance meaning Lunar eclipse meaning Lunar inequality meaning Lunar month meaning Lunar rainbow meaning Lunar tide meaning Lunation meaning Lunicurrent interval meaning Lunitidal interval meaning Lurch meaning Lux meaning L-z graph meaning Madrepore meaning Magenta meaning Magma meaning Magnet meaning Magnetic annual change meaning Magnetic annual variation meaning Magnetic anomaly meaning Magnetic azimuth meaning Magnetic bearing meaning Magnetic chart meaning Magnetic compass meaning Magnetic compensation meaning Magnetic compensator meaning Magnetic course meaning Magnetic daily or diurnal variation meaning Magnetic declination meaning Magnetic deviation meaning Magnetic dip meaning Magnetic element meaning Magnetic equator meaning Magnetic field meaning Magnetic field intensity meaning Magnetic field strength meaning Magnetic inclination meaning Magnetic induction meaning Magnetic intensity meaning Magnetic latitude meaning Magnetic lines of force meaning Magnetic meridian meaning Magnetic moment meaning Magnetic needle meaning Magnetic north meaning Magnetic observations meaning Magnetic observatory meaning Magnetic permeability meaning Magnetic pole meaning Magnetic range meaning Magnetic retentivity meaning Magnetic secular change meaning Magnetic station meaning Magnetic storm meaning Magnetic survey meaning Magnetic temporal variation meaning Magnetic variation meaning Magnetism meaning Magnetism induced meaning Magnetism permanent meaning Magnetism residual meaning Magnetism subpermanent meaning Magnetism temporary meaning Magnetism terrestrial meaning Magnetism transient meaning Magnetization meaning Magnetize meaning Magnetogram meaning Magnetograph meaning Magnetometer meaning Magnetometer cesium meaning Magnetometer flux-gate meaning Magnetometer helium meaning Magnetometer nuclear precession meaning Magnetometer optical pumping meaning Magnetometer proton precession meaning Magnetometer quartz horizontal meaning Magnetometer rubidium vapour meaning Magnetometer transit meaning Magnetometer unifilar meaning Magnetometer vector airbone meaning Magnetometer survey meaning Magnetometric zero balance meaning Magnetostriction meaning Magnetostriction transducer meaning Magnetron meaning Magnification meaning Magnifying glass meaning Magnifying power meaning Magnitude meaning Mainland meaning Main scheme station meaning Maintained depth meaning Maintenance meaning Major planet meaning Make the land meaning Make way meaning Making way meaning Manoeuvre meaning Mangrove meaning Manometer meaning Mantle meaning Manuscript map meaning Map meaning Map anaglyphic meaning Map base meaning Map cadastral meaning Map contour meaning Map hemispherical meaning Map index meaning Map manuscript meaning Map planimetric meaning Map reconnaissance meaning Map relief meaning Map sketch meaning Map special purpose meaning Map substitute meaning Map thematic meaning Map topographic meaning Map nadir meaning Map parallel meaning Map projection meaning Map scale meaning Marcq st meaning Maregraph plongeur meaning Margin meaning Marginal information or data meaning Marigram meaning Marigraph meaning Marina meaning Marine meaning Marine barometer meaning Marine biology meaning Marine borer meaning Marine chart meaning Marine farm meaning Marine light meaning Marine navigation meaning Marine nature reserve u.S meaning Marine railway meaning Marine sextant meaning Marine stabilizer meaning Maritime meaning Maritime boundary delimitation meaning Maritime meteorology meaning Maritime safety information msi meaning Mark meaning Mark geodetic meaning Mark boat meaning Marker meaning Marker beacon meaning Marker buoy meaning Marker radiobeacon meaning Marks and deeps meaning Marl meaning Marsden chart meaning Marsh meaning Massif meaning Mass transport meaning Master meaning Master compass meaning Master gyro compass meaning Master station meaning Masthead meaning Masthead angle meaning Mathematical model meaning Matthews table meaning Matrix meaning Matte meaning Maximum thermometer meaning Meander often in plural meaning Mean diurnal high water inequality meaning Mean diurnal low water inequality meaning Mean draft meaning Mean higher high water m.H.H.W. meaning Mean high water m.H.W. meaning Mean high water lunitidal interval m.H.W.I. meaning Mean high water neaps m.H.W.N. meaning Mean high water springs m.H.W.S. meaning Mean lower low water m.L.L.W. meaning Mean lower low water springs m.L.L.W.S. meaning Mean low water m.L.W. meaning Mean low water lunitidal interval m.L.W.I. meaning Mean low water neaps m.L.W.N. meaning Mean low water springs m.L.W.S. meaning Mean neap range meaning Mean neap rise meaning Mean noon meaning Mean range of tide meaning Mean rise of tide meaning Mean sea level meaning Mean solar day meaning Mean solar time meaning Mean sounding velocity meaning Mean sphere depth meaning Mean spring range meaning Mean spring rise meaning Mean square error meaning Mean sun meaning Mean tide level meaning Mean time meaning Mean water level meaning Measured distance meaning Measured mile meaning Measurement meaning Median line meaning Median valley meaning Medimarimeter meaning Medium frequency mf meaning Medusa meaning Megacycle meaning Megahertz meaning Melting point meaning Menu meaning Mercator transverse meaning Mercator chart meaning Mercator projection meaning Mercator sailing meaning Mercurial or mercury barometer meaning Meridian meaning Meridian astronomical meaning Meridian celestial meaning Meridian central meaning Meridian compass meaning Meridian geodetic meaning Meridian geographical meaning Meridian greenwich meaning Meridian grid meaning Meridian initial meaning Meridian local meaning Meridian magnetic meaning Meridian photograph meaning Meridian prime meaning Meridian principal u.S meaning Meridian standard meaning Meridian terrestrial meaning Meridian meaning Meridian zone meaning Meridian altitude meaning Meridian angle meaning Meridian-arc method meaning Meridian distance meaning Meridian distance double meaning Meridian passage meaning Meridian sailing meaning Meridian telescope meaning Meridian transit meaning Meridional difference meaning Meridional distance meaning Meridional orthographic projection meaning Meridional parts meaning Meridional plane meaning Meroplankton meaning Mesa a high tableland s.W meaning Messenger meaning Metacentre or metacenter meaning Meteor meaning Meteoric dust meaning Meteorite meaning Meteorological element meaning Meteorological observations meaning Meteorological optical range table meaning Meteorological tide meaning Meteorological visibility meaning Meteorology meaning Meter meaning Meter wheel meaning Method of squares meaning Metonic cycle meaning Metre or meter meaning Metric system meaning Metrology meaning Micrometer meaning Micrometer filar meaning Micrometer impersonal meaning Micrometer ocular meaning Micrometer run of meaning Micrometer transit meaning Micrometer comb meaning Micrometer drum meaning Micrometer microscope meaning Micrometer screw meaning Micron meaning Microphone meaning Microprocessor meaning Microsecond meaning Microseisms meaning Microwave meaning Microwave distance measurement meaning Mid-channel buoy meaning Middle ground meaning Middle ground buoy meaning Middle latitude meaning Middle latitude sailing meaning Mid-extreme tide meaning Midnight meaning Mil 1 meaning Mile meaning Military practice area meaning Milky way meaning Millibar meaning Milligal meaning Mineral development platform meaning Minimum squares meaning Minimum thermometer meaning Minor control meaning Minor control plot meaning Minor planet meaning Minus soundings meaning Minute meaning Mirage meaning Mirage inferior meaning Mirage superior meaning Mire meaning Mirror meaning Mist meaning Mixed current meaning Mixed layer meaning Mixed seas meaning Mixed tide meaning Moat or sea moat meaning Mobile rig meaning Mobile station meaning Mock moons meaning Mock suns meaning Mock-up meaning Modulated wave meaning Modulating wave meaning Modulation meaning Modulation amplitude meaning Modulation frequency meaning Modulation pulse meaning Modulation sideband meaning Modulation space meaning Moire meaning Moiré effect meaning Mole meaning Moment meaning Moment of inertia meaning Momentum meaning Monitoring meaning Monochromatic meaning Monsoon meaning Montage meaning Month meaning Month anomalistic meaning Month dracontic meaning Month lunar meaning Month nodical meaning Month sidereal meaning Month synodical meaning Month tropical meaning Monument u.S meaning Moon meaning Moonbow meaning Moor meaning Mooring meaning Mooring buoy meaning Morse code light meaning Mosaic meaning Mosaic controlled meaning Most probable value meaning Mother vessel meaning Mount meaning Mountain meaning Mountains meaning Mountain chain meaning Mountain range meaning Mouse meaning Mouth meaning Mud meaning Mud red meaning Mud snapper meaning Multi-beam echo sounder meaning Multiple echoes meaning Multiple lens camera meaning Multiple lens photograph meaning Multiple sea sampler meaning Multiple tide staff meaning Multiplex meaning Multispectral imagery meaning Multispectral scanner meaning Nadir meaning Nadir ground meaning Nadir map meaning Nadir photograph meaning Nadir point meaning Nadir radial meaning Name meaning Nanosecond meaning Nansen bottle meaning Napier's or napier diagram meaning Narrow-beam echo sounder meaning Narrows meaning Natural frequency meaning Natural scale meaning Natural year meaning Nature of the bottom meaning Nautical meaning Nautical almanac meaning Nautical astronomy meaning Nautical chart meaning Nautical mile meaning Nautical plan meaning Nautical twilight meaning Nautophone meaning Navarea meaning Navigability meaning Navigable meaning Navigable area surveys nas meaning Navigable semicircle meaning Navigable waters meaning Navigation meaning Navigation acoustic meaning Navigation aerial meaning Navigation air meaning Navigation astro meaning Navigation celestial meaning Navigation coastwise meaning Navigation doppler meaning Navigation electronic meaning Navigation grid meaning Navigation hyperbolic meaning Navigation inertial meaning Navigation land meaning Navigation long range meaning Navigation marine meaning Navigation offshore meaning Navigation radio meaning Navigation short range meaning Navigation sonic meaning Navigation submarine meaning Navigation surface meaning Navigation underwater meaning Navigational meaning Navigational aid u.S meaning Navigational astronomy meaning Navigational drafts meaning Navigational observation meaning Navigational parameters meaning Navigational planets meaning Navigational or navigation satellite meaning Navigational stars meaning Navigational triangle meaning Navigational warning meaning Navstar global positioning system meaning Navtex meaning Neaped meaning Neap high water meaning Neap low water meaning Neap range meaning Neap rise meaning Neap tides meaning Nearshore meaning Neat line meaning Nebula pl meaning Neck meaning Needle meaning Negative meaning Negative altitude meaning Negative engraving meaning Negative gradient meaning Nekton meaning Neritic province meaning Network meaning New chart meaning New edition of chart meaning New ice meaning New moon meaning New print of chart meaning New print date of chart meaning New survey meaning Newton meaning Niggerhead meaning Night effect or error meaning Nimbostratus meaning Nipped meaning Nipping meaning No-bottom soundings meaning No-check position meaning Noctiluca meaning Nocturnal arc meaning Nodal point meaning Nodal point emergent meaning Nodal point front meaning Nodal point incident meaning Nodal point rear meaning Node meaning Nodical month meaning Nodules meaning Noise meaning Nominal range meaning Nomogram or nomograph meaning Nonharmonic constants meaning Nonharmonic method meaning Nontidal current meaning Noon meaning Noon apparent meaning Noon local apparent meaning Noon mean meaning Normal meaning Normal equation meaning Normal water meaning North compass meaning North grid meaning North magnetic meaning North true meaning North celestial pole meaning North geographical pole meaning Northing meaning North magnetic pole meaning Notch or gap meaning Notice to mariners meaning Nuclear precession magnetometer meaning Numerical scale meaning Nunatak meaning Nun buoy meaning Nutation meaning Nyquist frequency meaning Object-glass meaning Objective meaning Objective lens meaning Oblate spheroid meaning Oblique photograph meaning Oblique plotting instrument meaning Obliquity of the ecliptic meaning Obscured meaning Observation meaning Observations astronomical meaning Observations magnetic meaning Observations meteorological meaning Observations tidal meaning Observation equation meaning Observation spot or pillar meaning Observation tower meaning Observed altitude meaning Observed tide meaning Obstruction meaning Obstruction buoy meaning Obstruction light meaning Occasional light meaning Occluded front meaning Occlusion meaning Occultation meaning Occupy meaning Ocean meaning Ocean acoustic tomography meaning Ocean current meaning Ocean eddy meaning Ocean remote sensing meaning Oceanic circulation meaning Oceanic plateau meaning Oceanic province meaning Oceanic ridge meaning Oceanographic cast meaning Oceanographic features meaning Oceanographic slide rule meaning Oceanographic section meaning Oceanographic station meaning Oceanographic survey meaning Oceanography meaning Oceanology meaning Ocean station meaning Ocean station vessel osv meaning Ocean water meaning Ocean weather station meaning Octant meaning Ocular micrometer meaning Odograph meaning Odometer or hodometer meaning Oersted meaning Offing meaning Offset meaning Offset lithography meaning Offshore meaning Offshoren. meaning Offshore navigation meaning Offshore wind meaning Off soundings meaning Ohm meaning Oil field meaning Old ice meaning Omnibearing meaning Omnidirectional antenna meaning Omnidirectional beacon meaning Omnidirectional range meaning Omnirange meaning One-way traffic lane meaning Onshore wind meaning On soundings meaning On the beam meaning On the bow meaning On the quarter meaning Ooze meaning Opacity optical meaning Opalescence meaning Open coast meaning Open end traverse meaning Opening meaning Open pack ice meaning Open port meaning Open roadstead meaning Open sea meaning Open sound meaning Open traverse meaning Open water meaning Operating system meaning Operative sheet meaning Opisometer meaning Opposite coasts meaning Opposition meaning Optical axis meaning Optical centre meaning Optical flat meaning Optical parallax meaning Optical path meaning Optical pumping magnetometer meaning Optical square meaning Optical system meaning Orange peel sampler meaning Orbit meaning Ordinate meaning Organization for economic cooperation and development oecd meaning Orientation meaning Orientation absolute meaning Orientation basal meaning Orientation exterior meaning Orientation inner meaning Orientation interior meaning Orientation outer meaning Orientation photogrammetric meaning Orientation relative meaning Orientation of plane table meaning Orientation of surveying instrument meaning Origi in surveying meaning Origin false meaning Original meaning Original chart meaning Origin of coordinates meaning Orography meaning Oropesa sweep meaning Orthochromatic meaning Orthodrome meaning Orthogonal meaning Orthographic projection meaning Orthometric correction meaning Orthomorphic meaning Orthomorphic projection meaning Orthophotograph meaning Orthophotomap meaning Orthophotomosaic meaning Orthophotoscope meaning Oscillation meaning Oscillator meaning Oscillatory wave meaning Oscillograph meaning Oscilloscope meaning Otter meaning Outcrop meaning Outer harbour meaning Outer limit meaning Outfall diffuser meaning Outflow meaning Outgoing stream meaning Output meaning Overfalls meaning Overlap meaning Overlapping pair meaning Overlay meaning Overlay tracing meaning Overprint meaning Overtide meaning Ozalid print meaning Pack ice meaning Pair of compasses meaning Paleomagnetism meaning Pancake ice meaning Panchromatic meaning Panel meaning Pantograph meaning Paper meaning Parabola meaning Parachute drogue meaning Parallactic angle meaning Parallactic error meaning Parallactic grid meaning Parallax meaning Parallax absolute stereoscopic meaning Parallax angular meaning Parallax annual meaning Parallax diurnal meaning Parallax equatorial horizontal meaning Parallax geocentric meaning Parallax heliocentric meaning Parallax horizontal meaning Parallax instrumental or instrument meaning Parallax linear meaning Parallax optical meaning Parallax personal meaning Parallax solar meaning Parallax vertical meaning Parallax x- meaning Parallax y- meaning Parallax bar meaning Parallax correction meaning Parallax difference meaning Parallax in altitude meaning Parallax inequality meaning Parallel meaning Parallel astronomical meaning Parallel celestial meaning Parallel geodetic meaning Parallel geographical meaning Parallel ground meaning Parallel isometric meaning Parallel photograph meaning Parallel principal meaning Parallel standard meaning Parallel motion protractor meaning Parallel of altitude meaning Parallel of declination meaning Parallel of latitude meaning Parallel plate meaning Parallel rulers or rule meaning Parallel sailing meaning Parallel sounding meaning Parameter meaning Parametric meaning Parametric latitude meaning Paranthelion meaning Parantiselena meaning Paraselene meaning Paraselenic circle meaning Parhelia associated with the 22 halo meaning Parhelia associated with the 46 halo meaning Parhelic circle meaning Partial eclipse meaning Partial node meaning Partial tide meaning Particle velocity meaning Particular scale meaning Pascal meaning Pass meaning Passage meaning Passage meridian meaning Passive system meaning Passometer meaning Pass point meaning Patch meaning Patent log meaning Path meaning Pattern meaning P-code meaning Peak meaning Pebble meaning Pecked line meaning Pedometer meaning Pelagic-abyssal sediments meaning Pelagic division meaning Pelorus meaning Pencil meaning Pencil beam meaning Pendulum meaning Pendulum working meaning Pendulum sextant meaning Peninsula meaning Peninsula submarine meaning Perch meaning Percolation meaning Perigean range of tide meaning Perigean tides meaning Perigee meaning Perihelion meaning Period meaning Period of a navigational light meaning Periodic current meaning Periodic error meaning Periodic waves meaning Peripheral equipment meaning Permafrost meaning Permanent current meaning Permanent international association of navigation congresses pianc meaning Permanent magnetism meaning Permeability magnetic meaning Personal correction meaning Personal equation meaning Personal error meaning Personal parallax meaning Perspective centre meaning Perspective grid meaning Perspective plane meaning Perspective projection meaning Perspective ray meaning Perturbation meaning Ph meaning Phantom bottom meaning Phase meaning Phase angle meaning Phase inequality meaning Phase lag meaning Phase modulation meaning Phase of a navigational light meaning Phases of the moon meaning Phase velocity meaning Phenomenon pl meaning Phonometer meaning Phosphorescence meaning Phot meaning Photic meaning Photoalidade meaning Photo base meaning Photocompose meaning Photocontrol point meaning Photodelineation meaning Photoelectric pilot meaning Photoengraving meaning Photogoniometer meaning Photogram meaning Photogrammetric camera meaning Photogrammetric control meaning Photogrammetric extension meaning Photogrammetric survey meaning Photogrammetry meaning Photogrammetry aerial meaning Photogrammetry analytical or analytic meaning Photogrammetry terrestrial meaning Photograph meaning Photograph aerial meaning Photograph composite meaning Photograph ground meaning Photograph high oblique meaning Photograph horizontal meaning Photograph low oblique meaning Photograph multiple lens meaning Photograph oblique meaning Photograph terrestrial meaning Photograph vertical meaning Photograph axes meaning Photograph centre meaning Photograph coordinates meaning Photograph meridian meaning Photograph nadir meaning Photograph parallel meaning Photograph perpendicular meaning Photographic interpretation meaning Photography meaning Photography aerial meaning Photogravure meaning Photohead plotter meaning Photoindex meaning Photolithograph meaning Photolithography meaning Photomap meaning Photometeor meaning Photometer meaning Photosphere meaning Photosynthesis meaning Phototheodolite meaning Phototopography meaning Phototriangulation meaning Photozincography meaning Pictomap meaning Picture control point meaning Picture plane meaning Piedmont meaning Pie graph meaning Pier meaning Pierhead meaning Piezoelectric effect meaning Piezoelectricity meaning Piggot gun meaning Pigmentation meaning Pigments meaning Pile meaning Piling meaning Pillar buoy meaning Pilot meaning Pilot chart meaning Pilot station meaning Pilot waters meaning Pilotage waters meaning Ping meaning Pinger meaning Pingo meaning Pingo-like features plf meaning Pinnacle meaning Pinnacled iceberg meaning Pinpoint meaning Pip meaning Pipe meaning Pipeline meaning Pitch meaning Pitching meaning Pivot meaning Pivot point meaning Pixel meaning Plain meaning Plan meaning Plane horizontal meaning Plane vertical meaning Plane coordinates meaning Plane rectangular coordinates meaning Plane sailing meaning Plane surveying meaning Planet meaning Planets inferior meaning Planets major meaning Planets minor meaning Planets navigational meaning Planets superior meaning Plane table meaning Plane table traverse meaning Planetary meaning Planetoid meaning Planform meaning Planimeter meaning Planimetric map meaning Planimetry meaning Planisphere meaning Plankton meaning Plan position indicator ppi meaning Planning chart meaning Plat u.S meaning Plate meaning Plateau meaning Plate level meaning Platform meaning Platform mineral development meaning Platform offshore meaning Platform piled meaning Platform jacket meaning Plot meaning Plotter meaning Plotting meaning Plotting board meaning Plotting sheet meaning Plotting sheet electronic meaning Plumb bob meaning Plumb line meaning Plumb line deflection of meaning Plumb point meaning Plummet meaning Plunging breaker meaning Pluviograph meaning Pocket compass meaning Poincaré wave meaning Point meaning Pointing line meaning Point of aries meaning Point of arrival meaning Point of destination meaning Point of origin meaning Point of symmetry meaning Polar aurora meaning Polar axis meaning Polar bearing meaning Polar chart meaning Polar circle meaning Polar coordinates meaning Polar distance meaning Polar front meaning Polar ice meaning Polaris correction meaning Polarization meaning Polarization error meaning Polar orthographic projection meaning Polder meaning Pole meaning Pole celestial meaning Pole depressed meaning Pole elevated meaning Pole geographical meaning Pole magnetic meaning Pole terrestrial meaning Pollution meaning Polyconic projection meaning Polygon meaning Polynia meaning Polyvinyl corer meaning Pond meaning Pontoon meaning Pool meaning Porosity meaning Port meaning Port authority meaning Port handbook meaning Position meaning Position adjusted meaning Position apparent meaning Position assumed meaning Position astronomical meaning Position dead reckoning meaning Position detached meaning Position estimated meaning Position field meaning Position geodetic meaning Position geographical meaning Position relative meaning Position angle meaning Position angles meaning Position approximate meaning Position circle meaning Position dilution of precision pdop meaning Position doubtful meaning Positioning meaning Position line meaning Positive meaning Positive altitude meaning Positive gradient meaning Post meaning Potable water intake pwi meaning Potential density meaning Potential temperature meaning Pound meaning Power meaning Precautionary area meaning Precession meaning Precession of the equinoxes meaning Precipitation meaning Precipitation intensity meaning Precision meaning Precision ephemeris meaning Predicted tides meaning Preferred channel mark meaning Preferred datum meaning Preliminary survey meaning Press proof meaning Pressure atmospheric meaning Pressure barometric meaning Pressure hydrostatic meaning Pressure sound meaning Pressure-altitude meaning Pressure gauge meaning Pressure gradient meaning Pressure hydrophone meaning Pressure ice meaning Pressure plate meaning Pressure ridge meaning Pressure wave meaning Price-gurley current meter meaning Pricker meaning Primary circle meaning Primary great circle meaning Primary radar meaning Primary tide meaning Primary tide station meaning Prime meridian meaning Prime vertical meaning Prime vertical circle meaning Priming of the tides meaning Principal axis meaning Principal distance meaning Principal line meaning Principal meridian meaning Principal parallel meaning Principal plane meaning Principal point meaning Principal scale meaning Principal vertical circle meaning Print meaning Print blue meaning Print contact meaning Print ozalid meaning Print ratio meaning Printing plates meaning Prismatic astrolabe meaning Probability meaning Probable error meaning Probe meaning Processor meaning Production platform meaning Profile a graph or curve showing elevation or distribution of some property vs meaning Profiling continuous seismic meaning Program or programme meaning Programming language meaning Progressive wave meaning Progress sketch meaning Prohibited area meaning Projection meaning Projection azimuthal or zenithal meaning Projection azimuthal equidistant meaning Projection azimuthal orthomorphic meaning Projection cassini meaning Projection conformal meaning Projection conic or conical meaning Projection cylindrical meaning Projection equal area meaning Projection equivalent meaning Projection geometric meaning Projection gnomonic meaning Projection inverse mercator meaning Projection lambert conformal conic meaning Projection mercator meaning Projection meridional orthographic meaning Projection orthographic meaning Projection orthomorphic meaning Projection perspective meaning Projection polar meaning Projection polyconic meaning Projection skewed meaning Projection stereographic meaning Projection stereographic horizontal meaning Projection stereographic meridional meaning Projection stereographic polar meaning Projection transverse cylindrical orthomorphic meaning Projection transverse mercator meaning Projection universal transverse mercator meaning Projection zenithal meaning Projector meaning Projector reflecting meaning Prolate spheroid meaning Prominent object meaning Promontory meaning Proof meaning Proof plotting meaning Propagated error meaning Properties of sea water meaning Proportional dividers meaning Protected reversing thermometer meaning Proton precession magnetometer meaning Protractor meaning Protractor cust meaning Protractor parallel motion meaning Protractor three arm meaning Province meaning Psephyte meaning Psychrometer meaning Pseudorange meaning Puddle meaning Pull meaning Pulsar meaning Pulse or impulse meaning Pulse length meaning Pulse modulation meaning Pulse radio altimeter meaning Pulse repetition rate meaning Pumice meaning Punch register system meaning Punched or punch card equipment meaning Pycnocline meaning Q-factor meaning Qtg station meaning Quadrant meaning Quadrantal correctors meaning Quadrantal deviation meaning Quadrantal sphere meaning Quadrature meaning Quadripod meaning Quality control meaning Quality of the bottom meaning Quarantine anchorage meaning Quarantine buoy meaning Quarter-diurnal tides meaning Quartering sea meaning Quarter point meaning Quartz meaning Quartz clock meaning Quartz horizontal magnetometer meaning Quay meaning Quayage meaning Quenching meaning Quicksand meaning Quintant meaning Q-wave meaning Race meaning Racon meaning Radar meaning Radar primary meaning Radar secondary meaning Radar altimeter meaning Radar beacon meaning Radar bearing meaning Radar buoy meaning Radar chain meaning Radar chart meaning Radar conspicuous object meaning Radar dome meaning Radar surveillance station meaning Radargrammetry meaning Radar guided tracks meaning Radar reflector meaning Radar-responder meaning Radarsonde meaning Radar target meaning Radar view meaning Radial meaning Radial nadir meaning Radial centre meaning Radial distortion meaning Radial plot meaning Radial triangulation meaning Radian meaning Radiant energy meaning Radiant flux meaning Radiation meaning Radiation fog meaning Radio meaning Radio aids meaning Radio acoustic ranging meaning Radio acoustic sound ranging meaning Radio altimeter meaning Radiobeacon meaning Radiobeacon buoy meaning Radio bearing meaning Radiocommunications meaning Radio compass meaning Radio direction finder meaning Radio direction finding or finder station meaning Radio fog signal meaning Radio frequency meaning Radio horizon meaning Radiolocation meaning Radio mast meaning Radiometer meaning Radio navigation meaning Radio navigational warning meaning Radio range meaning Radio range station meaning Radio receiver meaning Radio signals list of meaning Radiosonde meaning Radio sonobuoy meaning Radio spectrum meaning Radio stars meaning Radio station meaning Radiotheodolite meaning Radio time signal meaning Radio transmitter meaning Radio waves meaning Radius cruising meaning Radius of visibility meaning Radius vector meaning Radome meaning Rafted ice meaning Rafting meaning Rain meaning Rainbow meaning Rainfall amount meaning Rain gauge meaning Raise the land meaning Ram meaning Ramark meaning Ramp meaning Random error meaning Range cruising meaning Range diurnal meaning Range geographical meaning Range great tropic meaning Range luminous meaning Range magnetic meaning Range nominal meaning Range small diurnal meaning Range small tropic meaning Range finder meaning Range height indicator meaning Range lights meaning Range of mountains meaning Range of tide meaning Range of visibility meaning Range rod meaning Rapids meaning Raster data presentation meaning Rate meaning Rate station meaning Rational horizon meaning Ratio of ranges meaning Ratio of rise meaning Ratio print meaning Ravine meaning Ray meaning Rayleigh criterion meaning Reach meaning Real image meaning Rear light meaning Rear nodal point meaning Receiver meaning Recession of a shoreline meaning Reciprocal bearing meaning Reciprocal levelling meaning Reckoning meaning Recommended course meaning Recommended route meaning Recommended track meaning Reconnaissance meaning Reconnaissance map meaning Reconnaissance survey meaning Recorder meaning Recording anemometer meaning Recording barometer meaning Recoverable station meaning Recovery of station meaning Rectangular coordinates meaning Rectification meaning Rectified altitude meaning Rectilinear current meaning Rectilinear stream meaning Rectoblique plotter meaning Recurrence rate meaning Red mud meaning Red sector meaning Red tide meaning Reduced latitude meaning Reduction meaning Reduction of soundings meaning Reduction of tides meaning Reduction to centre meaning Reduction to sea level meaning Reduction to the meridian meaning Reed horn meaning Reef meaning Reef flat meaning Reference direction meaning Reference ellipsoid meaning Reference level meaning Reference line meaning Reference mark meaning Reference object. meaning Reference plane meaning Reference point meaning Reference spheroid or ellipsoid meaning Reference station meaning Reference tape meaning Reflectance meaning Reflected wave meaning Reflecting projector meaning Reflecting telescope meaning Reflection meaning Reflection angle of meaning Reflectivity meaning Reflector meaning Refracted wave meaning Refracting telescope meaning Refraction meaning Refraction angle meaning Refraction astronomical meaning Refraction atmospheric meaning Refraction coastal meaning Refraction coefficient of meaning Refraction index of meaning Refraction correction meaning Refraction of light meaning Refraction of water waves meaning Refuge meaning Regime meaning Registration meaning Region a,b meaning Regression of the nodes meaning Regular error meaning Relative accuracy meaning Relative aperture meaning Relative bearing meaning Relative humidity meaning Relative motion meaning Relative orientation meaning Relative position meaning Relative speed meaning Relative tilt meaning Relative wind meaning Release meaning Relief meaning Relief submarine meaning Relief displacement meaning Relief map meaning Relief model meaning Remanence meaning Remote sensing meaning Remotely operated vehicle rov meaning Repeatability meaning Repeatable accuracy meaning Repeater meaning Repeating instrument meaning Repeating theodolite meaning Repetition method of observation meaning Repetition rate meaning Reported danger meaning Representative fraction meaning Reprint of a chart u.S terminology meaning Reproducible meaning Reproduction meaning Repromat meaning Reseau meaning Resection meaning Resection station meaning Reservoir meaning Residual meaning Residual deviation meaning Residual error meaning Residual magnetism meaning Resolution meaning Resolving power meaning Resonance meaning Resonant frequency meaning Resource exploration meaning Responder meaning Responder beacon meaning Response meaning Responsor meaning Restitution meaning Restricted area meaning Resurvey meaning Retardation meaning Retentivity magnetic meaning Reticle or reticule meaning Reticle ring meaning Retired line of position meaning Retrogression of a beach meaning Reverberation meaning Reverse azimuth meaning Reversing current meaning Reversing thermometer meaning Reversing water bottle meaning Revetment meaning Revolution meaning Revolver meaning Revolving light meaning Rho-teta system meaning Rhumb meaning Rhumb line meaning Rhumb line sailing meaning Ria meaning Ridge meaning Rift meaning Rift valley meaning Rig meaning Right ascension meaning Right bank meaning Right reading meaning Rill mark meaning Rip current meaning Ripple meaning Ripple mark meaning Rip-rap meaning Rips meaning Rise meaning Rise of tide meaning Rising tide meaning River meaning River discharge meaning River harbour meaning River mouth meaning River roadstead meaning Rivulet meaning Roads meaning Roadstead meaning Roaring forties meaning Roberts radio current meter meaning Rock meaning Rock awash meaning Rock borer meaning Rocket meaning Rocket sounding meaning Rocket station meaning Rock flour meaning Rockweed meaning Rock which covers and uncovers meaning Rocky area meaning Rod meaning Rod levelling meaning Rod range meaning Rod sounding meaning Rodded points meaning Rodman meaning Roentgen rays meaning Roll or rolling meaning Roller meaning Rollers blind meaning Roof prism meaning Root mean square error meaning Rose meaning Rossby waves meaning Rotary current meaning Rotary stream meaning Rotating light meaning Rotating loop radiobeacon meaning Rotating prism meaning Rotating radiobeacon station meaning Rotation meaning Rotten ice meaning Roundabout meaning Route recommended meaning Route or routeing chart meaning Routeing meaning Routeing guide meaning Routeing system meaning Rubble meaning Rubidium vapour magnetometer meaning Rudite or rudyte meaning Ruin meaning Ruling meaning Run meaning Run a line of soundings meaning Runnel meaning Running fix meaning Running survey meaning Run of micrometer meaning Run-up meaning Runway meaning Runway lights meaning Sac meaning Saddle meaning Safety aids meaning Safety fairway meaning Safety zone meaning Safe water mark meaning Sag correction tape meaning Sailing meaning Sailing composite meaning Sailing great circle meaning Sailing mercator meaning Sailing meridian meaning Sailing middle-latitude meaning Sailing parallel meaning Sailing plane meaning Sailing rhumb line meaning Sailing spherical meaning Sailing traverse meaning Sailing chart meaning Sailing directions meaning Saint elmo's fire meaning Saint hilaire method meaning Salina meaning Salinity meaning Salinometer meaning Sallying ship meaning Salt marsh meaning Salt pans meaning Sample meaning Sampling meaning Sand meaning Sand dune meaning Sanding meaning Sandwave meaning Sargasso or sargassum meaning Saros meaning Satellite meaning Satellite artificial meaning Satellite navigational or navigation meaning Satellite boat meaning Satellite geodesy meaning Satellite navigation meaning Satellite sounding meaning Satellite station meaning Saturation meaning Savonius rotor current meter meaning Scale meaning Scale bar meaning Scale border meaning Scale equivalent meaning Scale fractional meaning Scale graphic meaning Scale large meaning Scale latitude meaning Scale linear meaning Scale logarithmic meaning Scale log factor meaning Scale natural meaning Scale numerical meaning Scale parallel meaning Scale particular meaning Scale principal meaning Scale small meaning Scale speed meaning Scale error meaning Scale factor meaning Scale of hydrographic survey meaning Scan meaning Scanner meaning Scanning meaning Scar meaning Scarp meaning Scattering meaning Scend meaning Schist meaning School meaning Scintillation meaning Scope meaning Scoria pl meaning Scour meaning Scree meaning Screen meaning Scribing meaning Sea meaning Seabed sampler meaning Seabed texture chart meaning Seabed topography meaning Sea bottom temperature meaning Seaboard meaning Sea bed meaning Sea or lake breeze meaning Sea bottom meaning Sea bottom sediment chart meaning Sea buoy meaning Sea channel meaning Sea floor meaning Sea fog meaning Seagrass meaning Sea ice meaning Sea level meaning Sea level datum meaning Seamanship meaning Seamark meaning Sea mile meaning Sea moat meaning Seamount or peak meaning Seamount chain meaning Seamount group meaning Seamount range meaning Seaport meaning Sea reach meaning Sea scarp meaning Seashore meaning Seasonal current meaning Sea state meaning Sea valley meaning Sea wall meaning Seaward meaning Sea water meaning Sea water colour of meaning Seaway meaning Seaweed meaning Secchi disc meaning Second meaning Secondary port meaning Secondary radar meaning Secondary station meaning Secondary tides meaning Secondary tide station meaning Second nodal point meaning Second order triangulation meaning Section meaning Sector scan sonar meaning Secular change meaning Sediment meaning Sediments bottom meaning Sediment survey meaning Sedimentary meaning Sedimentary rocks meaning Sedimentation meaning Sediment core meaning Sedimentology meaning Sediment trap meaning Seiche meaning Seismic reflection meaning Seismic refraction meaning Seismic sea wave meaning Seismograph meaning Seismology meaning Selectivity meaning Selenotrope meaning Self-aligning level meaning Semaphore meaning Semicircular deviation meaning Semidiameter meaning Semidiameter correction meaning Semidiurnal current meaning Semidiurnal tide meaning Semi-enclosed sea meaning Semimajor axis meaning Semiminor axis meaning Send meaning Sensibility of magnetic compass meaning Sensibility or sensitivity of spirit level meaning Sensible horizon meaning Sensitive bubble meaning Sensitivity of electronic equipment meaning Sensitivity of spirit level meaning Separation effect meaning Separation line meaning Separation zone or line meaning Sequence of current meaning Sequence of tide meaning Serial temperatures meaning Set meaning Set of observations meaning Settlement meaning Sexagesimal meaning Sextant meaning Sextant air meaning Sextant bubble meaning Sextant gyro meaning Sextant hydrographic meaning Sextant marine meaning Sextant pendulum meaning Sextant sounding british terminology meaning Sextant surveying meaning Sextant adjustment meaning Sextant altitude meaning Sextant altitude correction meaning Sextant chart meaning Sextant error meaning Sextometer method meaning Shade meaning Shaded relief meaning Shade glass meaning Shading meaning Shadow pin meaning Shadow zone meaning Shallow meaning Shallows meaning Shallow water meaning Shallow water constituent meaning Shallow water corrections meaning Shallow water tides meaning Shallow water wave meaning Shear strength meaning Shelf meaning Shelf break meaning Shelf edge or shelf break meaning Shell meaning Shelving meaning Shimmer meaning Shingle meaning Ship of opportunity meaning Ship-to-shore triangulation meaning Shipyard meaning Shoal meaning Shoaling effect meaning Shoot meaning Shore meaning Shoreface meaning Shore lead meaning Shoreline meaning Shoreline map meaning Shore station meaning Short baseline acoustic system meaning Short range navigation meaning Short wave meaning Shower meaning Shuga meaning Shutter meaning Shutter between-the-lens meaning Shutter focal-plane meaning Shutter louver meaning Side echoes meaning Side lap meaning Side-looking airborne radar slar meaning Side scan sonar meaning Side scan sonar mosaic meaning Sidereal meaning Sidereal chronometer meaning Sidereal day meaning Sidereal hour angle meaning Sidereal month meaning Sidereal time meaning Sidereal year meaning Side shot meaning Siemens meaning Sight meaning Sight line meaning Sight or sighting vane meaning Signal meaning Signal eccentric meaning Signal fog meaning Signal hydrographic meaning Signal longitude meaning Signal luminous meaning Signal sound meaning Signal survey meaning Signal tide meaning Signal time meaning Signal topographic meaning Signal triangulation meaning Signal tripod meaning Signal water meaning Signal weather meaning Signal lamp meaning Signal station meaning Signi meaning Sill meaning Sill depth meaning Silt meaning Siltation meaning Simplex meaning Simultaneous altitudes meaning Simultaneous comparison of depths meaning Single buoy mooring sbm meaning Single day tide meaning Single point mooring spm meaning Sinker meaning Sinking meaning Siren meaning Si system meaning Sketch map meaning Sketch survey meaning Skew convergence meaning Skewed projection meaning Sky compass meaning Sky wave meaning Sky-wave correction meaning Slack tide meaning Slack water meaning Slant distance meaning Slant range meaning Slave meaning Slave station meaning Slide dark meaning Slide or sliding rule meaning Slime meaning Slip meaning Slipway meaning Slope meaning Slope and height factor meaning Slope angle meaning Slope correction tape meaning Slotted-template triangulation meaning Slough meaning Sludge meaning Sluice meaning Slush meaning Small circle meaning Small correction british terminology meaning Small craft chart meaning Small diurnal range meaning Small halo meaning Small scale meaning Small tropic range meaning Smoothing meaning Smooth sheet u.S meaning Snag meaning Snapper meaning Snapper mud meaning Snow meaning Snowstorm meaning Soft iron meaning Software meaning Soil meaning Solar apex meaning Solar cell meaning Solar day meaning Solar eclipse meaning Solar parallax meaning Solar radiation meaning Solar system meaning Solar tide meaning Solar time meaning Solar year meaning Solenoid meaning Solid meaning Solitary wave meaning Solstice meaning Solsticial colure meaning Solsticial point meaning Solsticial tides meaning Sonar meaning Sonargram meaning Sonar target meaning Sonic bearing meaning Sonic depth finder meaning Sonic frequency meaning Sonic line of position meaning Sonic navigation meaning Sonic wave meaning Sono-buoy meaning Sono-radio buoy meaning Sound meaning Sound buoy meaning Sound channel meaning Sounder meaning Sounder echo meaning Sounding meaning Sounding acoustic meaning Sounding danger meaning Soundings detached meaning Sounding doubtful meaning Sounding drift meaning Sounding echo meaning Sounding fixed angle meaning Sounding formation meaning Sounding hand lead meaning Sounding line of meaning Soundings minus u.S meaning Soundings no bottom u.S meaning Sounding wire meaning Soundings zero u.S meaning Sounding apparatus meaning Sounding board meaning Sounding book meaning Sounding bottle meaning Sounding datum meaning Sounding interval meaning Sounding lead meaning Sounding line meaning Sounding machine meaning Sounding mark british terminology meaning Sounding pole meaning Sounding record meaning Sounding rod meaning Sounding selection meaning Sounding tube meaning Sounding wire meaning Sound intensity meaning Sound pressure meaning Sound ray meaning Sound signal meaning Sound signal submarine meaning Sound velocity meaning Sound wave meaning Source meaning Source diagram meaning South celestial pole meaning South geographical pole meaning Southing meaning South magnetic pole meaning Space coordinates meaning Space modulation meaning Spar buoy meaning Sparker meaning Spatial meaning Special mark meaning Special purpose map meaning Specific gravity meaning Spectroscope meaning Spectrum pl meaning Specular reflection meaning Speed meaning Speed angular meaning Speed ground meaning Speed linear meaning Speed relative meaning Speed line meaning Speed made good meaning Speed of lens meaning Speed of propagation meaning Speed of relative movement meaning Speed of sound meaning Speedometer meaning Speed scale meaning Sphere meaning Spherical aberration meaning Spherical buoy meaning Spherical coordinates meaning Spherical excess meaning Spherical sailing meaning Spherical wave meaning Spheroid meaning Spheroid oblate meaning Spheroid prolate meaning Spheroid of reference meaning Spicule meaning Spilling breaker meaning Spindle meaning Spire meaning Spirit bubble meaning Spirit compass meaning Spirit level meaning Spirit level axis meaning Spirit levelling meaning Spit meaning Splines meaning Split fix meaning Split line of sounding meaning Spoil meaning Spoil banks meaning Spoil ground meaning Spoil ground buoy meaning Spot elevation meaning Spot height meaning Spout meaning Spray meaning Spring meaning Spring high water meaning Spring low water meaning Spring range meaning Spring rise meaning Spring tides meaning Spur meaning Squall meaning Squall line meaning Squares method of meaning Squaring down meaning Squaring up meaning Squat meaning Stability meaning Stability static meaning Stabilization gyroscopic meaning Stabilizer marine meaning Stadia meaning Stadia constant meaning Stadia interval meaning Stadia lines meaning Stadia rod meaning Stadia wires meaning Stadimeter meaning Stake meaning Stand meaning Standard meaning Standard atmosphere meaning Standard chronometer meaning Standard circle sheet meaning Standard compass meaning Standard depth meaning Standard deviation meaning Standard error meaning Standard meridian meaning Standard parallel meaning Standard port meaning Standard sea water meaning Standard station meaning Standard tape meaning Standard time meaning Standardization meaning Standing wave meaning Stand of tide meaning Standpipe meaning Star meaning Starboard meaning Star chart meaning Star finder meaning Star globe meaning Star identifier meaning Starred lines of sounding meaning State of sea scale meaning State of sky meaning State of the sea meaning Static instability meaning Static stability meaning Station meaning Station astronomical meaning Station control meaning Station eccentric meaning Station electronic navigation meaning Station intersection meaning Station laplace meaning Station 'lost' meaning Station magnetic meaning Station main scheme meaning Station oceanographic meaning Station reference meaning Station resection meaning Station satellite meaning Station secondary meaning Station subordinate meaning Station subsidiary meaning Station supplementary meaning Station survey meaning Station tide meaning Station topographic meaning Station traverse meaning Station triangulation meaning Station trigonometric meaning Station unrecoverable meaning Stationary wave meaning Stationary wave theory meaning Station buoy meaning Station error meaning Station mark or marker meaning Station pointer british terminology meaning Statoscope meaning Statute mile meaning Steel tape meaning Steep-to meaning Steerageway meaning Steering compass meaning Steering repeater meaning Stellar parallax meaning Stellite meaning Steradian meaning Stereocomparator meaning Stereocompilation meaning Stereogram meaning Stereographic horizon projection meaning Stereographic meridional projection meaning Stereographic polar projection meaning Stereographic projection meaning Stereometer meaning Stereometric camera meaning Stereomodel meaning Stereopair meaning Stereophotogrammetry meaning Stereoscope meaning Stereoscopic fusion meaning Stereoscopic image meaning Stereoscopic model meaning Stereoscopic pair meaning Stereoscopic plotting instrument meaning Stereoscopic vision meaning Stereoscopy meaning Stereotriangulation meaning Sternway meaning Still water level meaning Stippling meaning Stone meaning Stooping meaning Stop meaning Stop watch meaning Storage meaning Storm meaning Storm high water meaning Storm surge meaning Storm tide meaning Storm warning meaning Storm wave meaning Straight-edge meaning Straight line meaning Strait also straits meaning Straits used for international navigation meaning Strand meaning Strand & i. meaning Stranded meaning Strath meaning Stratification meaning Stratocumulus meaning Stratopause meaning Stratosphere meaning Stratum pl meaning Stratus meaning Strays meaning Stream meaning Stream ebb meaning Stream flood meaning Stream ingoing meaning Stream outgoing meaning Stream rectilinear meaning Stream rotary meaning Stream tidal meaning Stream current meaning Streamer meaning Streamline meaning Streamline flow meaning Strength of current meaning Strength of figure meaning Striding level meaning Strip meaning Strip coordinates meaning Strip film or stripping film meaning Stripes of colour meaning Strong gale meaning Structure meaning Stylus meaning Subastral point meaning Sub-bottom profiler meaning Sub-celestial point meaning Sublunar point meaning Submarine bell meaning Submarine cable meaning Submarine canyon meaning Submarine geology meaning Submarine navigation meaning Submarine oscillator meaning Submarine peninsula meaning Submarine pipeline meaning Submarine relief meaning Submarine ridge meaning Submarine sentry meaning Submarine sound channel meaning Submarine sound signal meaning Submarine spring meaning Submarine valley meaning Submarine volcano meaning Submerged meaning Submerged rock meaning Subordinate station meaning Subpermanent magnetism meaning Subplan meaning Sub-point meaning Sub-sea completion meaning Subsidiary station meaning Subsoil meaning Subsolar point meaning Subsonic meaning Substellar point meaning Substitute centre meaning Substitute map meaning Subsurface current meaning Subsurface mark meaning Subsurface sound channel meaning Subtense bar meaning Subtense method meaning Sue meaning Sugar loaf meaning Sugar loaf sea meaning Summer solstice meaning Summer time meaning Summit meaning Sumner line meaning Sumner method meaning Sun meaning Sun apparent meaning Sun mean meaning Sun true meaning Sun compass meaning Sundial meaning Sunken rock meaning Sunrise meaning Sunset meaning Sunshine recorder meaning Sunspot meaning Sunspot cycle meaning Super high frequency shf meaning Superior conjunction meaning Superior mirage meaning Superior planets meaning Superior transit meaning Superjacent waters meaning Super-short baseline acoustic system meaning Supersonic meaning Supplemental control meaning Supplemental control point meaning Supplementary station meaning Surf meaning Surface boundary layer meaning Surface current meaning Surface duct meaning Surface mark meaning Surface navigation meaning Surface of position meaning Surface reflection meaning Surface temperature meaning Surface wave meaning Surf zone meaning Surge meaning Surge negative meaning Surge positive meaning Surging breaker meaning Surround meaning Survey meaning Survey aerial meaning Survey cadastral meaning Survey coastal meaning Survey exploratory meaning Survey geodetic meaning Survey geological meaning Survey graphic control meaning Survey gravimetric meaning Survey ground meaning Survey harbour meaning Survey hydrographic meaning Survey land meaning Survey large scale meaning Survey magnetic meaning Survey magnetometer meaning Survey new meaning Survey oceanographic meaning Survey offshore meaning Survey photogrammetric meaning Survey preliminary meaning Survey reconnaissance meaning Survey revisory meaning Survey running meaning Survey sketch meaning Survey sonar meaning Survey tagline meaning Survey topographic meaning Survey wire-drag meaning Survey buoy meaning Survey boat meaning Surveying meaning Surveying plane meaning Surveying or mapping camera meaning Surveying sextant meaning Survey mark meaning Survey net meaning Surveyor meaning Surveyor's compass meaning Survey sheet meaning Survey or surveying ship or vessel meaning Survey signal meaning Survey station meaning Survey traverse meaning Swallow float meaning Swamp meaning Swash meaning Swash channel meaning Swash mark meaning Swashway meaning Swathe meaning Swathe sounding system meaning Sway meaning Sweep meaning Sweeping meaning Swell meaning Swing meaning Swinger meaning Swinging buoy meaning Swinging ship meaning Swirl error meaning Symbol meaning Synodical month meaning Synodic or synodical period meaning Synoptic analysis meaning Synoptic chart or map meaning Synoptic forecast meaning Synoptic hour meaning Synoptic meteorology meaning Synoptic observation meaning Synthetic aperture radar sar meaning Syntony meaning Systematic error meaning System development meaning Systems of sounding lines meaning Syzygy meaning Syzygy tide meaning Table meaning Tableland meaning Tablemount meaning Tabular berg meaning Tabulation meaning Tachometer meaning Tachymeter or tacheometer meaning Tachymetry meaning Tach stave levelling staff meaning Taffrail meaning Taffrail log meaning Tagline meaning Tagline survey meaning Tail wind meaning Talus meaning Talweg or thalweg meaning Tandem control meaning Tank meaning Tangent screw meaning Tape meaning Tape alignment correction meaning Tape base meaning Tape catenary correction meaning Tape grade correction meaning Tape invar meaning Tape length correction meaning Tape reference meaning Tape sag correction meaning Tape standard meaning Tape steel meaning Tape temperature correction meaning Tape tension correction meaning Tape corrections meaning Tape stretcher meaning Tape thermometer meaning Taping meaning Target meaning Target false meaning Tartan plots meaning Taut wire measuring gear meaning Taut wire mooring meaning Tectonics meaning Telecommunication meaning Telegraph buoy meaning Telemeteorograph meaning Telemeter meaning Telemeter electronic meaning Telemetry meaning Telemotor meaning Telescope meaning Telescope meridian meaning Telescope photo zenithal meaning Telescope reflecting meaning Telescope refracting meaning Telescope zenith meaning Telescopic alidade meaning Telltale compass meaning Telluric currents meaning Temperature meaning Temperature correction levelling meaning Temperature correction tape meaning Temperature inversion meaning Temperature lapse rate meaning Temperature-salinity diagram meaning Template or templet meaning Temporal meaning Temporal variation meaning Temporary magnetism meaning Tension correction tape meaning Tented ice meaning Terminal meaning Terrace meaning Terrain meaning Terrestrial camera meaning Terrestrial equator meaning Terrestrial globe meaning Terrestrial latitude meaning Terrestrial longitude meaning Terrestrial magnetic field meaning Terrestrial magnetism meaning Terrestrial meridian meaning Terrestrial navigation meaning Terrestrial photogrammetry meaning Terrestrial photograph meaning Terrestrial pole meaning Terrigenous meaning Terrigenous sediments meaning Territorial sea meaning Territorial waters meaning Tesla meaning Test meaning Texas tower meaning Thalweg meaning Thaw meaning Thematic map meaning Theodolite meaning Theodolite direction meaning Theodolite faces of meaning Theodolite repeating meaning Theodolite transit meaning Theodolite axes meaning Theodolite drag meaning Theoretical error meaning Thermal equator meaning Thermal layer meaning Thermocline meaning Thermocline transient meaning Thermogram meaning Thermograph meaning Thermohygrograph meaning Thermometer meaning Thermometer deep sea meaning Thermometer dry-bulb meaning Thermometer maximum meaning Thermometer minimum meaning Thermometer protected reversing meaning Thermometer reversing meaning Thermometer tape meaning Thermometer unprotected meaning Thermometer wet-bulb meaning Thermometric depth meaning Thermometric levelling meaning Thermoprobe meaning Third order triangulation meaning Three-arm protractor meaning Three-point fix meaning Three-point fix method meaning Three-point problem meaning Threshold meaning Threshold speed meaning Thunder meaning Thunderstorm meaning Tidal basin meaning Tidal bore meaning Tidal constants meaning Tidal constituent meaning Tidal current meaning Tidal current chart meaning Tidal current signal meaning Tidal or tide cycle meaning Tidal datum meaning Tidal day meaning Tidal difference meaning Tidal epoch meaning Tidal flat meaning Tidal harbour meaning Tidal lights meaning Tidal movement meaning Tidal observations meaning Tidal prediction meaning Tidal range meaning Tidal rise meaning Tidal stream meaning Tidal theories meaning Tidal water meaning Tidal wave meaning Tide meaning Tide analysis meaning Tides apogean meaning Tide astronomical meaning Tide compound meaning Tide diurnal meaning Tide double a double-headed tide meaning Tide earth meaning Tide ebb meaning Tides equatorial meaning Tide equilibrium meaning Tides equinoctial spring meaning Tide falling meaning Tide flood meaning Tide half meaning Tide high meaning Tide leeward or lee meaning Tide low meaning Tide lunar meaning Tide meteorological meaning Tide mid-extreme meaning Tide mixed meaning Tides mixed diurnal meaning Tides mixed semidiurnal meaning Tides neap meaning Tide oceanic meaning Tide partial meaning Tides perigean meaning Tides predicted meaning Tide primary meaning Tides quarter-diurnal meaning Tide rising meaning Tides secondary meaning Tide semidiurnal meaning Tides shallow water meaning Tide single day meaning Tide slack meaning Tide solar meaning Tides solsticial meaning Tides spring meaning Tide storm meaning Tide syzygy meaning Tide tropic meaning Tide vanishing meaning Tide weather meaning Tide windward meaning Tide-bound meaning Tide bulge meaning Tide crack meaning Tide curve meaning Tide cycle meaning Tide gate meaning Tide gauge meaning Tide-generating force meaning Tideland meaning Tide lock meaning Tidemark meaning Tide pole meaning Tide-predicting machine meaning Tide or tidal prediction meaning Tide-producing forces meaning Tide race meaning Tide range meaning Tide reducer meaning Tide register meaning Tide rips meaning Tide signal meaning Tide staff meaning Tide staff multiple meaning Tide station meaning Tide tables meaning Tidewater meaning Tide wave meaning Tideway meaning Tie meaning Tie in meaning Tie net meaning Tie point meaning Till meaning Tillite meaning Tilt meaning Tilt base meaning Tilt relative meaning Tilting level meaning Time meaning Time apparent meaning Time apparent solar meaning Time astronomical meaning Time civil meaning Time daylight saving meaning Time geological meaning Time greenwich meaning Time greenwich civil meaning Time greenwich mean gmt or greenwich civil meaning Time local meaning Time local apparent meaning Time local mean meaning Time local sidereal meaning Time mean meaning Time mean solar meaning Time sidereal meaning Time solar meaning Time standard meaning Time summer meaning Time true solar meaning Time universal meaning Time zone meaning Time ball meaning Timepiece meaning Time signal meaning Time tag meaning Time zone meaning Tinted areas meaning Title meaning Titration meaning Tolerance meaning Ton meaning Tongue meaning Tonnage meaning Topmark meaning Topmark buoy meaning Topoangulator meaning Topographic feature meaning Topographic map meaning Topographic model meaning Topographic signal meaning Topographic station meaning Topographic survey meaning Topography meaning Topography board meaning Toponymy meaning Tornado meaning Torrent meaning Torrid zone meaning Torsion balance meaning Total eclipse meaning Total magnetic intensity meaning Towering meaning Tracer meaning Tracing cloth meaning Tracing paper meaning Track meaning Track dead reckoning meaning Track great-circle meaning Track intended meaning Track radar guided meaning Track recommended meaning Track chart meaning Tracking meaning Tracking camera meaning Track line of sounding meaning Track made good meaning Track plotter meaning Trade winds meaning Traffic lane meaning Traffic separation scheme meaning Training wall meaning Trajectory meaning Transceiver meaning Transducer meaning Transducer magnetostriction meaning Transformation meaning Transforming printer meaning Transhipment or lightening area meaning Transient magnetism meaning Transient thermocline meaning Transit meaning Transit broken telescope meaning Transit local meaning Transit axis meaning Transit bearing meaning Transit instrument meaning Transitional water wave meaning Transition layer meaning Transition zone meaning Transit magnetometer meaning Transit micrometer meaning Transit passage meaning Transit theodolite meaning Transit traverse meaning Translocation meaning Transmitter meaning Transparency meaning Transponder meaning Transponder beacon meaning Transport meaning Transverse cylindrical orthomorphic projection meaning Transverse mercator grid meaning Transverse mercator projection meaning Transverse wave meaning Travelling wave meaning Traverse meaning Traverse astronomical meaning Traverse closed meaning Traverse hanging meaning Traverse open or open end meaning Traverse plane table meaning Traverse transit meaning Traverse net meaning Traverse point meaning Traverse sailing meaning Traverse station meaning Traverse table meaning Trench meaning Trend meaning Triangle of error meaning Triangulate meaning Triangulation meaning Triangulation arc of meaning Triangulation flare meaning Triangulation floating meaning Triangulation order of meaning Triangulation radial meaning Triangulation ship-to-shore meaning Triangulation classification meaning Triangulation net meaning Triangulation point meaning Triangulation signal meaning Triangulation station meaning Triangulation tower meaning Tribrach plate meaning Tributary meaning Trigonometric levelling meaning Trigonometric station meaning Trilaterate meaning Trilateration meaning Trim meaning Tripod meaning Tripod signal meaning Tripping device meaning Tripton meaning Trivet meaning Trochoidal wave meaning Tropical cyclone meaning Tropical month meaning Tropical year meaning Tropic higher high water meaning Tropic higher low water meaning Tropic high water inequality meaning Tropic lower high water meaning Tropic lower low water meaning Tropic low water inequality meaning Tropic of cancer meaning Tropic of capricorn meaning Tropic range meaning Tropics meaning Tropic tide meaning Tropopause meaning Troposphere meaning Tropospheric scattering meaning Trough meaning Trough compass meaning True meaning True altitude meaning True azimuth meaning True bearing meaning True course meaning True horizon meaning True meridian meaning True north meaning True solar time meaning True sun meaning True wind meaning Trumpet buoy meaning Trunnion axis meaning Tsunami meaning Tubular compass meaning Tufa meaning Tuff meaning Tuff-cone meaning Tunny net meaning Turbidite meaning Turbidity meaning Turbidity current meaning Turbulence meaning Turbulent flow meaning Turning basin meaning Turning buoy meaning Turning point meaning Turn of the tide meaning Twilight meaning Twilight stars meaning Two-way route meaning Tyfon meaning Type meaning Type face meaning Type of tide meaning Typhon meaning Typhoon meaning Ultra high frequency uhf meaning Ultrashort wave meaning Ultrasonic meaning Ultrasonic depth finder meaning Ultrasonics meaning Ultraviolet meaning Uncontrolled mosaic meaning Uncovered meaning Uncovers meaning Undercliff meaning Undercurrent meaning Underground mark meaning Underkeel clearance meaning Underkeel allowance meaning Undertow meaning Underwater acoustics meaning Underwater ice meaning Underwater navigation meaning Underwater photogrammetry meaning Underwater position fixing meaning Underwater sound projector meaning Underway or under way meaning Undulating meaning Undulation meaning Undulation of the geoid meaning Unidirectional antenna meaning Unifilar magnetometer meaning Uniform flow meaning Unit magnetic pole meaning United nations un meaning United nations conference on trade and development unctad meaning United nations development programme undp meaning United nations educational, scientific, and cultural organization unesco meaning Universal drafting machine meaning Universal level meaning Universal time ut meaning Universal time 0 ut0 meaning Universal time 1 ut1 meaning Universal time 2 ut2 meaning Universal time coordinated utc meaning Universal transverse mercator utm grid meaning Unprotected reversing thermometer meaning Unrecoverable station meaning Unsurveyed area meaning Unsurveyed clearance depth meaning Upland meaning Uplifted reef meaning Upper branch meaning Upper culmination meaning Upper limb meaning Upper limit of navigability meaning Upper transit meaning Uprush meaning Upstream meaning Upwelling meaning Vacuum lead meaning Valley meaning Valley median meaning Valley submarine meaning Valley line meaning Vane meaning Vanishing line meaning Vanishing point meaning Vanishing tide meaning Variate meaning Variation meaning Variation grid meaning Variation of the pole meaning Variometer meaning Varsol meaning Varve meaning Vectograph meaning Vector meaning Vector airborne magnetometer meaning Vector data presentation meaning Vectorial angle meaning Veering wind meaning Vein meaning Velocimeter meaning Velocity meaning Velocity of sound meaning Veneer meaning Vent meaning Venturi tube meaning Vernal equinox meaning Vernier meaning Vertex pl vertices meaning Vertical meaning Vertical axis meaning Vertical circle meaning Vertical clearance meaning Vertical collimator meaning Vertical control meaning Vertical control datum meaning Vertical deflection meaning Vertical dilution of precision meaning Vertical intensity of the earth's magnetic field meaning Vertical lights meaning Vertical parallax meaning Vertical photograph meaning Vertical plane meaning Very close pack ice meaning Very high frequency vhf meaning Very low frequency vlf meaning Very open pack ice meaning Vessel traffic service vts meaning Viaduct meaning Vibrating needle meaning Vibration meaning Vigia meaning Vignetting meaning Violent storm meaning Virtual image meaning Visibility meaning Visibility flight meaning Visibility meteorological meaning Visibility radius of meaning Visible horizon meaning Visual display unit vdu meaning Visual line of position meaning Voe meaning Volcanic ash meaning Volt meaning Vulgar or common establishment meaning Wadi meaning Wake meaning Waning moon meaning Want of correspondence meaning Warm front meaning Warm pool meaning Warning gale meaning Warning hurricane meaning Warning navigation meaning Warning storm meaning Warping buoy meaning Wash meaning Washovers meaning Watch meaning Watch comparing meaning Watch hack meaning Watch stop meaning Watch buoy meaning Water bottle meaning Water bottle insulated or insulating meaning Water bottle reversing meaning Water colour meaning Water column meaning Water content meaning Watercourse meaning Water front meaning Water levelling meaning Waterline meaning Water-parting meaning Water sample meaning Water sampler meaning Watershed meaning Water signal meaning Water sky meaning Water specimen cup meaning Water vapor meaning Waterway meaning Watt meaning Wave meaning Wave capillary meaning Wave carrier meaning Wave cellular meaning Wave compressional meaning Wave continuous meaning Wave cycloidal meaning Waves damped meaning Wave direct meaning