This format can...
read and write waypoints
read and write tracks
read and write routes
CompeGPS data files are those read and written by the CompeGPS™ TwoNav software (running on a Mac, a PC, or on select cell phones) as well as CompeGPS Land, and CompeGPS Air. These files are also used by the CompeGPS TwoNav Aventura and TwoNav Sportiva GPS receivers when they are in mass storage mode.
Release 6.1 of CompeGPS Land and CompeGPS Air added GPX as an import export format for waypoints, routes, and tracks. As GPX is a more heavily used format, you should probably use that for new applications.
For more information please see http://www.compegps.com
Index of route/track to write (if more than one in source).
Because this format supports only one route or track, this option may be used on output to select a single route or track from a collection of routes and tracks read from a more expressive format. If you have, say, a gpx file that contains two routes, you may use this option to write them one at a time to individual files.
gpsbabel -i gpx -f routes.gpx -o compegps,index=1 -F route1.txt -o compegps,index=2 -F route2.txt
Give points (waypoints/route points) a default radius (proximity).
This option specifies the default proximity for waypoints and route points.