This format can...
read and write tracks
GPSBabel supports .wpr and .trl files for Alan Map500 devices running operating system versions 2.xx.
.trl contain files tracklogs. If you use a CF-Card based
operating system, tracklog files must have a .TRL extension when
copied to the CF-Card. The default filename is TEMP_TRK.TRL.
Only one .TRL file may be present.
Alan's operating system 3.0 for Map500 is not supported yet. At the time of this writing, OS3 is still beta. Documentation on the new dataformats is sparse.
The Alan Map500 handheld GPSr is identical to the Holux GM101. This GPSBabel module has only been tested against the Alan Map500. Still, if you use a GM101, GPSBabel will probably be able to convert your waypoints, routes and tracklogs.
For more information on the Alan Map500 visit Alan Germany. There is very informative forum, too. The forum language is German but posts in English will be answered, too.