Thanks for the replies.
I did a file search on both the Garmin and the SSD card and neither have anything like gmapsupp.img. They dos seem to work alright on the surface but I will need to take the Montana out for a field trip and see what gives.
I did a file search on both the Garmin and the SSD card and neither have anything like gmapsupp.img. They dos seem to work alright on the surface but I will need to take the Montana out for a field trip and see what gives.