Do you already have a gps? If so you can only load maps onto it from teh manufacturer: as in Magellan gps can only use Magellan maps and Garmin gps can use Garmin maps. The exception is if you're using it realtime with a laptop on which you have different mapping software loaded and the gps is only providing a location. In a reverse situation, you can use a differnt mapping software to come up with waypoints and routes which you can then upload to the gps but those would only be overlayed on top of the maps that the GPS has loaded into it.