After a quick Google, it looks like GPSBabel (http://www.gpsbabel.org/) might support your GPS. If so, cross-compile it, see what module it needs to use for the usb and you should be away.

It does depend on what you want to do with the data after you've got it on the N8x0 of course, but it's probably possible to just have it emit NMEA messages and link this into gpsd so the N8x0 uses it.

Copying across waypoints and the like might be more what you want, you'd need to process the output of gpsbabel and import the result as a route, etc.