I haven't made progress on the strange n800 problem, but I have updated both minigpsd and added support to maemo-mapper specifically for minigpsd.

A patch against maemo-mapper 2.6.2 is attached (and is in the garage).

You will also need "unzip" to read kmz files.

This allows the minigpsd kmz files to be used for tracks and routes, generally anywhere gpx files would work.

It also uses the memory mapped status (once per second) instead of parsing NMEA if it detects it, so it should be much faster. My 10Hz GPS would overload the GPS thread.

I'm working on the OBD stuff and I also have a program that emulates minigpsd but READS the kmz files, so can replay them to external programs (including OBD and other data).

I'll post more details, but look for a minigpsd-0.31h in extras-devel, then extras shortly.