It's not a disk IMG-file, just a Gamin proprietary IMG map container file.
Copy to "[USB mass storage mode drive]:\Garmin\Gotalandv3.img" and start BaseCamp if you want to see the map on a PC or Mac. Otherwise you can use it on SD for a GPS in the appropriate path like "[SD card]:\Garmin\Gotalandv3.img", "[SD card]:\Map\Gotalandv3.img" or "[SD card]:\Garmin\gmapsupp.img" depending on the GPS capabilities.
There's no need to edit the MS flag since it's already set to 0.
Copy to "[USB mass storage mode drive]:\Garmin\Gotalandv3.img" and start BaseCamp.
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