TrackPro has been tested at several road courses across North America by professional drivers running hundreds of laps and has demonstrated accuracy comparable to timing equipment that costs
hundreds if not thousands of dollars more. That said, in certain conditions the accuracy of the built-in GPS falls outside the parameters we have set for the start/finish line of a track which results in a missed lap.  We're continually updating the track coordinates in our online database, and missing a lap should not happen frequently.

For best results, you will need to use a mount that securely attaches your iPhone to
your car's front windshield. It is also highly recommended that you charge your iPhone
while driving, or at least between sessions, as TrackPro uses more power than most
applications due to its extensive GPS usage.

TrackPro is intended for experienced drivers on official road courses, and is no
substitute for good driving judgment. TrackPro is not yet currently suitable for karting or
short-track racing. It is not recommended to watch your iPhone while driving.

TrackPro requires an iPhone 3G/3GS which has a built-in GPS.  TrackPro is NOT YET COMPATIBLE with iPod Touch or first generation iPhones.