Why are Magellan GPS receivers not supported / when will they be supported?
Time and lack of a sample Magellan GPS to work with. Magellan receivers will hopefully be directly supported at some point in the future. For now, you can download the free open source program called MacGPSBabel which downloads waypoints and tracklogs from Garmin and Magellan GPS receivers. Use MacGPSBabel to download and save your waypoints as a GPX file and then open this file with Terrabrowser. Note: make sure you download the version listed as “PPC” and called MacGPSBabel, otherwise you may have problems.