I have an etrex vista c. I originally used the trip and waypoint manager software that came with the unit. You can get it from Garmin for about $30. It will allow you to download mapping and routing to your GPS. However, it is not a detailed map. I bought the more detailed City Select v. 6 and am very happy with it. If you also want to download cache coordinates from geocaching.com then you can download Easy GPS for free.