Compass Engine
    interface CompassEngine
Interface defining the source of compass heading data that is consumed by the LocationComponent when in compass related RenderMode or CameraModes.
Functions
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                  Adds a CompassListener that can be used to receive heading and state changes.
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                  Provides the last know accuracy status from the sensor manager.
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                  Returns the last heading value produced and pushed via a compass listener.
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                  Removes a CompassListener that can be used to receive heading and state changes.