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Chapter I History of Navigation 62
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accuracy accurate adjustment Air Almanac altitude appear approximately atmosphere azimuth bearing called celestial body celestial equator celestial meridian celestial navigation chart chronometer circle coast computed correction course curve dead reckoning declination degaussing determined deviation difference direction distance earth equator error feet frequency given great-circle gyro compass H.O. Pub height of eye horizon hour Hydrographic Office indicated instrument interpolation intervals knots latitude light line of position located longitude loran marine sextant measured Mercator Mercator chart meridian angle method miles moon motion Nautical Almanac nautical charts 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 station surface tabulated temperature tidal tide tion U. S. Navy usually vertical vessel wave wind zenith