I was driving down I-66 in Virginia today using my iPhone's GPS and noticed that it's pretty awful. Most of the time it DID have my location, but occasionally it would suddenly show me as drifting off the road and into the woods or bodies of water. I can assure you I did no such thing. It would also sometimes stop tracking me even though the little track button was blue. Also the compass pisses me off. I'll be pointing the phone East while I'm driving East and it will say that I'm facing North or something ridiculous like that (on both the Compass and Google Maps). I know the TomTom GPS software & cradle promise to have "enhanced GPS performance." Does that mean not having the fail that I described above?