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AbNA acceleration Air Almanac aircraft anticlockwise approx Azimuth c-rod calculated centre Circle arc clockwise coefficient Comp Compass Course Conversion Angle correct corrector Devn diagram direction draw Earth East Easterly Equator error Example force formula GHAT given Greenwich Meridian Haversine Haversine formula heavenly body Hour Angle Hughes Inman Intercept Latitude log cosec log sec logarithms Long Longitude March 16 Mean Mercator Chart Moon navigator needle negative North plane Pole Position Circle Position Line Prime Vertical r-oo radians radius Refn Refraction rhumb right angles rotates seamiles sec True Mid sextant Sidereal Sidereal Day sights sin2 Sine Rule star Table Track triangle PZX True Course Varn velocity vertical West Westerly deviation Zenith Distance