This format can...
read and write routes
Support for Destinator™ itinerary files.
These have (mostly) extension .dat and are binary files. The file structure is undocumented and so this format was reverse engineered from some .dat files. At this time we can read and write name, comment and the coordinates of the route points.
Destinator™ by Destinator Technologies is a software for PNDs, Smartphones and PDAs.
gpsbabel -i destinator_itn -f from_A_to_B.dat -o gpx -F from_A_to_B.gpx