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Whenever I have had to transfer one platform's data files to another (e.g., Nat. Geo. Topo. to Garmin to GE, etc.) GPSBabel has been invaluable. http://www.gpsbabel.org/I am not aware of the format of the Hunting GPS Maps data, but if it is viewable on your GPS as a route or waypoints, you should be able to get it off the GPS into a usable format for conversion to GE. I'd check the EULA on Hunting GPS Maps, though. I would be surprised if that was an authorized use, since they appear to have a competing product.
If you have a Garmin GPs which I assume, why add google earth when you can add on Garmin's Birdseye, which is basically Garmin's verson of google earth designed for Garmin's specifically?
Birdseye is thw way to go. I love it.
Our new HUNT App gives you the options of several different layers, check it out here! HUNT App information - http://www.huntinggpsmaps.com/hunt-for-mobile-devices#.UsdBd7SQkZwOur HUNT for Google Earth overlay only works for your Google Earth download. As a fellow hunter I believe it is an awesome tool for scouting. HUNT for Google Earth Overlay information - http://www.huntinggpsmaps.com/store/computer-maps/google-earthIf you purchase a HUNT SD product it will work on your Garmin GPS and on Garmin Basecamp. HUNT SD information - http://www.huntinggpsmaps.com/store/gps-mapsBirdseye View is another option and our overlay just goes over the Birdseye. Birdseye works on Basecamp and your Garmin GPS.BirdsEye information - https://buy.garmin.com/en-US/US/maps/on-the-trail-maps/birdseye/birdseye-satellite-imagery/prod70144.htmlI hope this answers most your questions, let me know if you have any others, thanks everyone!