I've been hoping that the next iPhone will have real GPS, but I expect it won't. But could it receive GPS data via BT from an external BT GPSr? I believe most BT GPSr's transmit the data in a standard format (NMEA?). If the iPhone's BT would allow receipt of such data, it seems that some clever developer could generate some real, Garmin-like, GPS software for hiking, geocaching, etc. Would this be possible?