I use iPhone 3G AGPRS online 3G in google map. The blue colour circule will point my location. The pointer will move when i move. Is it commuicate with satellite? I also try to use iPod touch google map for checking my location. The pointer also point my location. But i must need search with WiFi first. Even i did not login wifi. It can still check my location. Is it ipod touch commuciate with satellite, too? I want to know they are the same skill for checking location? commuciate with satellite?