I have an iphone 3gs running 4.1 on 5.15 baseband and my gps just decided to stop working. I've tried deleting newly installed apps, reboots, restores, everything I can think of. Does anyone know if it could be a file that is missing or something of the sort? Any ideas would be greatly appreciated. I know all about the 6.15 baseband and assure you, I do not have it.