I want a gps to download dual sport rides into gps and go ride them and to ride off road and overlay where I rode on a map. The Montana seems the best (although expensive) and I saw a "rugged mount" to hard wire it to bike (although it says some kind of ball socket not included). I see people talking about mapsource or basemap. I guess my question is do I need to buy 3 programs (topo map, regular map, mapsource or basemap)? I'm not sure what kind of maps to use for the 2 thinks I want to do. I might want to use google maps somehow if I could. I'd kinda like an idea what I need before I start purchasing. I saw a topo map that said 100k and a southeast (where I am) topo map that said 24k but the what looked like smaller map was more expensive (which didn't make since). Sorry if the answers are obvious and thanks for any advice.