- 08-10-2009, 11:36 AM #2
- 08-10-2009, 12:55 PM #4
- 08-11-2009, 02:11 AM #6
It could also be a case of the GPS satellite network not being spot on with coordinates. The military has the best network, and consumers have a good network.
Some areas, like cities can sometimes make exact locations hard to get a fix with the satellite network, so the phone uses the A-GPS (cell tower assisted) to approximate your location through triangulation.
But, after reading a few complaints here in the forums, the device most likely has a faulty GPS chip inside. Take it to Apple and get it exchanged.
- 08-11-2009, 08:01 AM #7
- 08-11-2009, 11:26 AM #9
- 08-11-2009, 02:23 PM #10
You get better wifi data in dense areas, you get better cellular data in the country. It also works better when driving because it can follow the roads. If you turn and there's a road it's hard for it to get your location wrong if it moves the dot to a new road. It's also using the changing signal times from the cell towers to get your movement speed right. Get off road, say on a ferry, and it moves around for a bit even with a good signal near shore and may never be right.
The reason for the good location data in Manhattan is the wifi data. The tall buildings are blocking most of the GPS signals and cellular signals likely bounce some. they're just using gps to narrow down your location some more