GPS Drive Motion X is probably the best navigation app out there. For just $0.99, you get landscape view navigation, and voice turn by turn directions! Completely PWNS the built in Maps app that the iPhone 4 comes with. But does having landscape view nav w/ voice turn by turn directions come with a price? Yeah, besides the $0.99, it also completely drains your battery!!! I was navigating a 40 mile trip, just about a 40-50 minute drive, and more than half the time, probably about 60-80% of the time, my phone was asleep/locked. But even when it's locked, it's still sending a signal back and forth! So within the 45 minute drive, My battery life went from 86% to 64%!!!! I mean, when I play music it doesn't even drain my power that bad, but this was ridiculous! Does anyone else have the same problem with this app, or does anyone else out there even use this app? It's a great app, don't get me wrong, but you really need to have it plugged into your car to maintain some battery life.