How to use it? - manu-fwi/gps-ada GitHub Wiki

A few explanations on the basic design:

• The GPS coordinates are displayed (they are updated every 10s).
• If you press the button you enter the menu mode: turn the button and it will navigate through the menus, press the button again and you enter the selected menu. The 3 menus of interest are: "Deb Ch" which asks the GPS to begin log the GPS coordinates every 15s to its own memory. Every time you want to add a waypoint to mark something interesting, go to the "waypoint?" menu and press the button; it will add another waypoint, you can see its number on the screen. And finally when you're done you can save the whole trace to the SD card using the "Fin Ch" menu and say "oui" to save the trace and erase the memory of the GPS log. The name of the file is displayed on the screen. And voila!

One important thing: I can only dump the LOCUS log on the trace file which must then be decoded. I still had no time to really search for a good decoder, I only found gps-babel (google it), but I have not tested it.