Over the past few years I've used several different devices to record GPS logs. Starting in 2008 with an HTC Windows phone, switched to an HTC Evo running Andro

Over the past few years I've used several different devices to record GPS logs. Starting in 2008 with an HTC Windows phone, switched to an HTC Evo running Android in 2010, and in 2011 started using an iPhone. In order to get data at such a high resolution, I've gotten in the habit of turning on and off the GPS in order to conserve battery life. Also I usually carry backup batteries on me if I will be away from a computer for an extended period of time.