Why BT PAN. Why not BT SPP. Or WiFi. Or GPRS. Or TCP over USB. Here lies a problem. That, and BT PAN is not enabled by default.

I find BT PAN a rather strange solution btw. BT SPP is much easier to set up, and more widely supported. See, if it speaks TCP/IP, its easy to set up with GPSD, but GPSD can also talk to a device like rfcomm0.

On S60 I've used a Java ME program called ExtGPS for this purpose. Very simple. I can't imagine its too complex. But one should put it off after using to save battery juice.