BigGameHoundsmen.com

Has anyone converted GIS files to run on their Astro. The GIS files i have are in .sid format and not compatible with what garmins can run. Garmins support .gpx, gdb, kml, kmz, jpeg. I cant find much info on how to do it and the GIS files i have put the 'birdseye' imagery to shame.

You might go to gpsfiledepot and contact one of the guys running the site. He seems to be very knowledgeable about that kind of stuff.