Example image of eyePlorer eyePlorer map for 'Nautical chart': Coast Sea Bridge Earth's magnetic field Harbor Navigation Ocean current Scale (map) Tide Topographic map Water Electronic navigational chart Hydrographic survey Sounding line Echo sounding Shipwreck Wire Mast (sailing) Hydrographic office International Hydrographic Organization National Oceanic and Atmospheric Administration Local Notice to Mariners Notice to Mariners Mercator projection Gnomonic projection Level of measurement Conformal map Geodetic system Latitude Longitude World Geodetic System Bearing (navigation) Course (navigation) North Compass Magnetic declination True north Compass rose Automatic label placement Pilotage Sea mark Buoy Light characteristic Lighthouse Position fixing Underwater Fathom Foot (length) United States Contour line