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GPS is a satellite system that just tells your device where you're at. There's no communications with it. For live tracking the GPS sends location via bluetooth (I think - I don't use it) to your phone which then uses its internet connection (2G, 3G, etc) to fire off that location data to Garmin servers (via NSA, GCHQ, etc).
hippy
gillies
Had issues with using live track on Saturday. When my signal was poor (which was most of the ride, I was out in the sticks) it refused to update. Does it have to run through your phone - I had sorta hoped it would be enough to just run it through the GPS of the unit.