I wanted to connect to linux to download my first workout.
lsusb did not recognise the stick at first. Only when I installed garmin drivers found at software.opensuse.org, it would recognise the stick.
Ok, so now what...
I downloaded and compiled gant, from: https://github.com/jamesarbrown/Gant
Now to pair the device:
./gant -f mydevname -a auth405
Make sure your watch in settings has pairing on. This creates a tcx file, that you can import on endomondo, or garmin connect.
Now I am just experimenting and seeing if I can get a browser plugin to work... http://software.opensuse.org/package/GarminPlugin looks promising...