Hi

There's a thread on BT747 and Maemo here and I started of one on the BT747 site.

BT747 can read binary files, but also nmea, gpx (in J2SE version), csv, ... . It can generate a lot of different formats, including CSV.
You can try on Windows, Linux, Max if BT747 can read your GPX file. If it does, you can work towards getting something working on Maemo.