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accuracy accurate adjustment Air Almanac altitude appear approximately azimuth bearing buoys called celestial body celestial equator celestial meridian celestial navigation chart chronometer circle coast computed correction course curve dead reckoning declination degaussing depth determined deviation difference direction distance earth equator error feet frequency given gyro compass H.O. Pub height of eye horizon hour indicated instrument interpolation intervals knots latitude light line of position longitude loran marine sextant measured Mercator Mercator chart meridian angle method miles moon motion Nautical Almanac navigation observations obtained parallel perpendicular planets plotting polar pole pressure prime vertical radar radio refraction relative rhumb line rotation sailing scale sextant ship shown in figure signal solution speed stars surface tabulated temperature tidal tide tion triangle U. S. Navy U. S. Navy Hydrographic usually vertical vessel wave wind zenith