I don't think it's possible without data connection. As i remembered you can plan a journey at home using internet. As soon as you leave, you'll stay connected by satellites. If you change your route, you'll see it but there will be no recalculation just because there's no connection, think it's the same for saving locations I've installed Sygic MM10 Get a lock in a few seconds with the google server with or without internet. It's just like a normal GPS, like TomTom, etc... Yesterday tried it on foot in Brussels, no problem at all