方位角
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定义
从北方（0°/360°）顺时针测量的水平行进方向或目标方向，东为90°，南为180°，西为270°。
解释
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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