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Hello. For many years i have enjoyed using this site to load topo maps to my garmin. The process is fairly simple. I download the map set then open it in basecamp. From there i shade the areas i want then i install it on an mirco sd card, plug it in my garmin and bingo i have my maps. Lately I have been having a problem installing the map on the card. The other day I installed a map that i hade  in basecamp. I then installed the card in my garmin and it did not show under maps. Puzzled I pulled the card and looked at the card on the computer. I clicked on the card went to garmin then to gsmapp.img. When I clicked on gsmapp.img it came up that the file was corrupt. I do have another sd card with the same mapset on it and when i click on it shows me garmin then when i click on that it showes me the maps. It doesn't show me the file gsmapp.img just the maps after i click on garmin. I was able to copy the maps from one card to the other after i first errased the gsmapp.img file on the card in question and now both cards show the maps on garmin just fine. I can't seem to figure out the problem. I even uninstalled the entire mapset from my computer and downloaded it all over again in basecamp and it doesn't work. i have even reformatted the card and nothing. I am using windows 10 Can someone please help.