‘Had a running app for some time that gave me splits, pace, stride length, total time and time to finish, etc For running it was great for not having to look at a watch, but have the nice lady talk into my ear buds. I agree that for a TT it would be invaluable. For anyone out for longer than a couple of hours, battery life of the phone would be the limiter. And most people out for less than that time are probably not data junkies.