WatchPosition method is used to retrieve periodic updates of the current geographic location of the device and the location is expressed as a set of geographic coordinates along with heading and speed. Location information is returned in a Position object and each update returns a new Position object.
Below is the syntax of this method
watchPosition(showLocation, ErrorHandler, options);
Detail of parameters are given below
WatchPosition method returns a unique transaction ID (number) associated with the asynchronous call. This ID can be used to cancel the watchPosition call and to stop receiving location updates.
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