The only program you can download to the gps is Garmins program Mapsource (topo, highway, etc). I like the topo program because it gives you a reference point like mountains, old cemetary's, creeks, trails established in the last few years or older, etc. The graphics aren't that good, but the refernce points are handy. I hear Delorme makes good topo maps, but you can only download your gps waypoints and tracks "on top of" the Delorme generated maps. You can't download the delormes to the gps.