Basic Marine Navigation

accurate altitude azimuth buoys celestial equator celestial navigation celestial pole celestial sphere chronometer circle computed Corr correction curve cyclone D.R. position declination degree deviation diagram direction distance earth equal equator example feet Figure Greenwich height of eye hemisphere horizon hour angle Hydrographic Office index error interval Island knots latitude and longitude lifeboat light line of position Long longitude magnetic bearing magnetic course magnetic heading maneuvering board marine navigator marked measured Mercator chart method minutes of arc moon Nautical Almanac nautical miles navi noon sight north celestial pole observed obtained ocean pelorus planet plotting Polaris problem range relative bearing rhumb line sailing scale sextant sextant altitude shadow marker ship speed star sun's tide tion true bearing true course tude U.S. Coast U.S. Navy variation vertical vessel watch weather wind zenith Zone