Admittedly, I don't have the very best of GPS receivers, but if I take it off the top of the dash next to the windshield and place it where my N800 rests against the face of my speedometer (don't worry, it only blocks < 25 mph and > 80 mph), I can't get a GPS fix. If the N810 doesn't have an external GPS antenna, is it going to be useful? Do other GPS units (i.e. Garman, etc) have external antennas?