I came across this web based program for converting gps files from one format to another. You can now share your Garmin files with the buddy that runs a Migellian. http://www.gpsvisualizer.com/gpsbabel/ :bike:
You might BUT you need to make sure your Garmin file only uses data that's compatible with Magellan's spec on how it handles routes and waypoints. Plus you really need a Magellan GPS and/or software to check the converted file actually works. I've been using the source program, GPSbabel, on my computer to convert files but sometimes they just don't work so you need to be able to test them afterwards.