Apple Insider has learned today that the soon-to-be released TomTom Car Kit navigation dock will "not enable GPS functionality for the corresponding App Store software on the iPod touch and first-generation iPhone."

Although there has been some confusion about this revelation on various message boards around the web today, here's the real scoop. As we already know, the Kit dock is, indeed, compatible with all iPhone models. However, the TomTom app is only compatible with the iPhone 3GS and iPhone 3G, no matter if the
dock is connected to a first-generation iPhone or iPod touch.

http://modmyi.com/forums/ipod-news/6...pod-touch.html