I just wanted to let you know if you're like me and wondering that the GPS does work fine with no 3G contract and SIM. I haven't even opened the SIM slot yet.
I also installed my iPhone navigation software (iGo)and it works even better than on the iPhone. The updated of your position seem much faster than on the iPhone, and it seems more accurate.
Ok, the graphics in x2 mode are a little pixelated, but I doubt I'll be looking that closely when driving.