This format can...
write waypoints
HTML output generates a single HTML file of all of the waypoints in the input file. It supports a number of Groundspeak GPX extensions, as well as filters out potentially harmful HTML from the input file while maintaining almost all of the source HTML formatting.
The following command line reads a GPX file with Groundspeak extensions and writes an HTML file with encrypted hints that is rendered using a custom stylesheet:
gpsbabel -i gpx -f 12345.gpx -o html,stylesheet=green.css,encrypt -F 12345.html
Path to HTML style sheet.
Use this option to specify a CSS style sheet to be used with the resulting HTML file.
Encrypt hints using ROT13.
Use this option to encrypt hints from Groundspeak GPX files.