Note: This page describes an obsolete version of GPSBabel that may substantially differ from the current or development version.

Holux (gm-100) .wpo Format (holux)

This format can...

  • read and write waypoints

The Holux gm-100 (e-fox) gps receiver uses standard compact flash cards. File formats were provided by Holux-Taiwan to the author. The code was tested against version 2.27E1; other versions and receivers may work but have not been explicitly tested. Anyone with information on other Holux receivers is encouraged to contact

When copying the .wpo file to a flash card, the file must be named tempwprt.wpo as the receiver will ignore all other files.

Comparing the waypoints of a .wpo files against other formats like .gpx you may notice a small difference in the latitude and longitude values. The reason is the low resolution of the coordinates in the wpo file format. In a .wpo file the resolution is 1/10"; in gpx for example it is 1/100". A a practical matter, this loss is only about 1.7 meters (5 feet).

The generated waypoint files can also be used by MapShow version 1.14. This program is free of charge from the Holux web site.

This format was contributed by Jochen Becker.