Originally Posted by
John_V
Since you're going to have your cell phone with you, download the free RoadID app.
But he plans to buy a Garmin 820 anyway. Why download another app (potential security hole in your phone) and use it to run down the battery with GPS, when the Garmin solution is better? With LiveTracking, your phone's GPS never comes on because your watch or bike computer supplies that data, preserving your battery. In case you need to use your phone for something.