Originally Posted by Emmbeedee
Well it's clear that having the Thailand map on its own and as well in the gmapsupp.img could be a real problem. I'd probably remove gmapsupp, myself, and see how it goes from there. If you need the other maps which are contained in that file it would be best to add them individually using MapInstall. Having multiple maps loaded through one gmapsupp.img file is necessary on older Garmin units but your Montana will allow each of those in its own file.
And both the Cambodia and Thai maps are not unlocked for the device. I think your maps are the real problem.
You could be right about the unlocked maps, it does not explain the problems I had in Europe though.
I have removed the Thai street map from the Garmin unit as I do not have the originals of the other 4 combined maps
The error message went away, but the warnings are still there. I will have to live with that and see what happens when I enter Cambodia in a week or so