I downloaded Desert Southwest and transferred it from Map Source to my Montana 600 with no problems. When I tried to put in an address OR Intersections to create a route using the Automotive profile it asks for State or Province and wouldn't take Colorado, Utah, Arizona, etc.
If I set a Where To using other methods like Geocache, Waypoint, listed cities, it works fine. I know it's probably a simple thing but I have not been able to find a setting that works using addresses.
The data I used, from OpenStreetMap, and the compiler I used, cgpsmapper, have some routing limitations. I think you just found a few. I use it to get me to listed cities or POI, and it works fine for that.
OK - Thanks for the quick response. Still very useful even with the limitation.