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iOS中计算trueHeading、CLHeading时使用什么参考模型?

trueHeading 相对于真北的航向(以度为单位)。(只读)

@property(readonly, nonatomic) CLLocationDirection trueHeading

https://developer.apple.com/library/ios/documentation/CoreLocation/Reference/CLHeading_Class/Reference/Reference.html#//apple_ref/occ/instp/CLHeading/trueHeading

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