Quote Originally Posted by Mark View Post
Phone GPS does not use the cellular network. It uses the same satellites your GPS watch uses. The only difference is that phones have a better idea where they are in the world so the first fix is faster.
Hmm... I was under the impression that the phone uses cellular data to triangulate position and reverts to GPS only where a cellular signal is not available. This is why the phone doesn’t have to take the time to “sync” or acquire a satellite signal prior to a run (unlike a GPS watch).