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OnStar works on the Verizon wireless phone system. It has GPS for numerous reasons:
One, if the air bags are deployed, OnStar will attempt to call the occupants of the vehicle. If there is no answer, they will dispatch an emergency crew to the location given by the GPS.
If a vehicle is stolen, and OnStar has not been deactivated, they locate the vehicle with GPS.
If you pay for the additional services, they can actually direct you to your destination, or help you get back on track if you are lost. Again, they note your location via GPS.
They DO NOT randomly track you to see where you are. They will only give location information to the person in the vehicle, or to a police agency. They will not locate the vehicle for a wife or husband looking for their spouse. They do not sit around wondering where you are and tracking your movement.