This format can...
read and write tracks
Support for Destinator™ binary tracklogs (.dat).
The basic information was found at mozoft.com. In addition to the standard GPS track data of coordinates and timestamp, this format also stores the position fix and the number of satelites seen during recording.
Destinator™ by Destinator Technologies is a software for PNDs, Smartphones and PDAs.
gpsbabel -i destinator_trl -f last_trip.dat -o gpx -F last_trip.gpx