As of right now I am using my Samsung Galaxy Tab 2 10.1 for offline GPS, but I would like to be able to use my Pro instead. I have an old Sprint USB 3g/gps dongle, but I would like to see what else is available, and which works best for the Pro. It would also be nice if it was free of any monthly charges. I would use the Sprint dongle, but I don't really need 3g or a monthly overpriced data plan. Any suggestions?