The file is probably fine, it is just that you are trying to open, run, launch or execute the map file on a computer, it isn’t designed to work on a computer, just on a Garmin GPS device.

So, on a windows PC, if you see a message telling you that the file is “Corrupted” (Windows), it is because you are trying to open/run/execute the map file on your Windows computer. Which as you have found out doesn’t work; the map file is NOT a Disk or other Mountable Image file, no matter what your computer tells you. Nor is it a graphical image file (such as a picture, photograph, etc.) so it won’t open in a graphics editor or other graphics tool/app!

The error message looks like this:

Likewise, on a Mac, if you see a message telling you that the file is “Not Mountable” or “The Following Disk Images Could Not Be Opened”, it is because you are trying to open/run/execute the map file on your Mac computer. Which as you have found out doesn’t work; the map file is NOT a Disk or other Mountable Image file, no matter what your computer tells you.

The error message looks like this (or similar):

The IMG file is the map file in Garmin IMG (Map) format, ready for direct use on the Garmin device or installed on to a MicroSD card (as applicable).

If you are trying to use the map in BaseCamp, you can do this as follows:

• Attach the Garmin with the map installed on (or a MicroSD card in the Garmin) to your computer via the USB cable
• The map will be temporarily pulled in to BaseCamp, and you can use it in there to view and interact with the map, create tracks/routes/waypoints, etc. but only whilst the Garmin is attached to your computer.

We do offer dedicated BaseCamp versions of the map, either as a one-off purchase, or as part of a subscription. More information can be found here.