Note: This page describes an obsolete version of GPSBabel that may substantially differ from the current or development version.
This format can...
write waypoints
The SD card format used by the Magellan Explorist 400, 500, and 600 to describe geocaches. Notice what while the format can hold an infinite number of geocaches, the unit will read and silently discard all but 200 geocache POIs at a time.
You should name any file created with this format with a ".gs" extension so the firmware can read it.