GeolocationCoordinates.heading read-only property is a
double representing the direction in which the device is traveling. This value, specified in degrees, indicates how far off from heading due north the device is. Zero degrees represents true true north, and the direction is determined clockwise (which means that east is
90 degrees and west is
270 degrees). If
NaN. If the device is not able to provide heading information, this value is
let heading = geolocationCoordinatesInstance.heading
double representing the direction in which the device is traveling.
The definition of 'GeolocationCoordinates.heading' in that specification.
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