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Ok the Montana 680 I have is not showing in the map I moved to the Garmin folder of the GPS.  I downloaded the map and unzipped it and saved to my computer.  It is now an .img file.  I moved it from the computer to the Garmin folder in the GPS.  There are other .img files where I put this one.  I go to the maps screen and there is nothing in there that says CA-Central.  The instructions on the map down load screen says I should just be able to move the windows version of the .img file to my GPS.  I must be missing something.  Thanks