Made sense Daryl, thanks.
So if I want to put a map in a specific location I just treat the Montana/SD card as a std. USB device(s) and copy/paste the maps/files where I want them.
One last question from your comment
" I created and use a directory called 'My OSM Maps' to store various country maps, *.img files, that I'm not using. I don't need the gps or BC to load a map of Peru if I'm riding in Missouri."
If you decided you wanted to access the Peru map is there a way to tell the Montana to access it in your "My OSM Maps" folder directly from the Montana device or would you need access to a PC like device to move that map back into the Montana maps folder? Just curious.