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accuracy adjustment Air Almanac altitude AMVER antenna appear approximately axis azimuth angle bearing buoys called celestial body celestial equator celestial horizon celestial meridian celestial navigation celestial sphere chart chronometer circle coast compass computed correction course curves dead reckoning declination degaussing depth determined deviation diagram difference direction distance earth equator error frequency given gyro gyrocompass horizon hour angle Hydrographic indicated interpolation knots latitude light line of position longitude magnetic marine maximum measured meridian angle method miles moon motion Nautical Almanac nautical miles navigation Notice to Mariners observations obtained ocean parallel planets plotting polar pole radar radio range refraction relative rhumb line rotation sailing scale sextant ship shown in figure signal solution speed stars stations surface tabulated temperature tidal tide transit triangle tropical cyclones vertical vessel wave weather wind zenith