I use a Garmin iQue M3 (M4 or M5) LOVE it! PDA / GPS / CAR unit best all round device I have ever used. I think the M stands for Microsoft since it is operating on a windows mobile system. Garmin also has a iQue PDA/GPS that is NOT windows, I think it uses a Palm type system for all you non-MS geeks. Bought my iQue M3 on eBay for $150 new.