I got my Rikaline 6033 GPS working beautifully with Maemo-Mapper on IT2006. The n770 connects really fast by BT v1.2 to it, usually in under 1-2 secs.

The 6033 is really tiny, about 2/3 size of the small Nokia 6230 cell phone.
See http://www.rikaline.com/bluetooth_gps.htm

From cold, it locks onto the satellites in under 20secs, after a black spot, it locks on with 1-4 secs.

I'd recommend it, particularly as it's very small, and has some new GPS technology that you can read about on the www.