9.3 方向监测 拥有GPS硬件的设备可以生成设备的当前方向（course属性）和速度信息。iPhone设备携带的定位管理器可以返回一个已经计算好的course值，通过这个值我们可以获得当前前进的方向，course值是0～36..【继续阅读全文】
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