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A CompassHeading object is returned to the compassSuccess callback function.
magneticHeading: The heading in degrees from 0-359.99 at a single moment in time. (Number)
trueHeading: The heading relative to the geographic North Pole in degrees 0-359.99 at a single moment in time. A negative value indicates that the true heading can't be determined. (Number)
headingAccuracy: The deviation in degrees between the reported heading and the true heading. (Number)
timestamp: The time at which this heading was determined. (milliseconds)
The CompassHeading object is returned to the compassSuccess callback function.
trueHeading is not supported, but reports the same value as magneticHeading
headingAccuracy is always 0 because there is no difference between the magneticHeading and trueHeading
The trueHeading property is not supported, but reports the same value as magneticHeading.
The headingAccuracy property is always 0 because there is no difference between the magneticHeading and trueHeading.
The trueHeading property is only returned for location services enabled via navigator.geolocation.watchLocation().
For iOS 4 devices and above, heading factors in the device's current orientation, and does not reference its absolute position, for apps that supports that orientation.