Everything BUT the navigation on this app is great. My main issue is this.. It almost appears like the app takes too long to ask the satellite where you are. This results in hesitation and jumping no matter how clear your signal is. The program just has no clue where you are and basically guesses where you should be based on your last speed. This poses a problem at every stop sign, stop light, traffic obstruction, etc etc... This app FAILS. Next ill take a look at TomTom. So far Navigon is spot on and only once in a while ghosts about 20 feet, but quickly corrects.