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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.