I have not got mine in the car yet. But at my computer desk it seems to work. It will take some getting used to on such a small screen 7". I was disappointed that it placed my street address about 1 block west of where it should have. But the GPS icon showed up at exacly the right spot. Even 1/3 of the way between my street and the street behind me. Right about where my desk is.
I'm getting tired of waiting for the Power supply for this Mac Mini so I may get an Invertor this week and wait for the powersupply that has the right plug in May or June.