So my NON 3G iPad was sitting my lap as I was being driven down the street. I had google map up and a map of the town i was in so we didn't get lost. Somehow the iPad was able to follow our trip all through town, even though it was NOT connected to the internet and NOT connected to 3G since it doesn't have that option. I know it has an accelerometer, but I'd be very surprised if that's all it needs to track my position all over the city. How does it do this?