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azimuth barometer bearing celestial body celestial sphere chart Chron chronometer circle coast converting Dep Corr correction cosec cosines course cyclone D.Lo dead reckoning deviation Diff Difference of Latitude direction Dirt Dist distance Dlst earth east equator Harbor Head height horizon hour angle Hypote i'O i'O i'O intersection Island Lat Dep Latitude and Departure Lighthouse Cape Lighthouse Port line of position Logarithms Long longitude magnetic Mercator Sailing meridian meridian altitude method Middle Latitude Sailing miles multiplication of numbers Nautical Nautical Almanac navigator noon numbers by sines NxCos object parallax parallel plane right-angled triangles Plane Sailing plotted Point Lighthouse point of Aries position line right ascension Rock sextant ship Side sidereal solution of plane star temperature Trigonometric Functions tropical cyclones Vernal Equinox vertical vessel wind