A company called Route 66 has launched its latest global-positioning system program, Mobile 7 for Windows Mobile smartphones.
According to TMCnet.com:
Route 66 Mobile 7 determines its position using an advanced, highly sensitive wireless GPS receiver, using that information to guide the user with turn-by-turn voice instructions supplemented with on-screen visual directions.
More specs are listed in the article. The full kit is $299. The program only is $149. Both systems have been available in Europe for quite some time, but they're now in the United States and Canada.