方位角
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定義
北（0°/360°）から時計回りに度数で測定される水平方向の進行方向または目標方向。東は90°、南は180°、西は270°。
解説
Bearings are used in navigation, surveying, and military operations to communicate direction unambiguously. A 'true bearing' references geographic north, while a 'magnetic bearing' references magnetic north, which differ by the local magnetic declination. Sailors and pilots routinely correct between the two: in eastern North America, magnetic north lies roughly 10–15° west of true north.
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