I own some garmin maps, and have made some small, personal maps. I am in the process of making a larger, state map, but after I create it and load it into mapsource, I want to be able to select subsections (by county) of the map to load onto my device (like I can select states with the Garmin City Navigator maps).
How do I do this?
Sorry if this has been discussed elsewhere, my search was unsuccessful.