How to create installation for .img file which will only work on installed GPS

Started by RCinSTP, May 17, 2016, 11:21:40 AM

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I have a .img file which I would like to distribute for use with Garmin GPS handheld units for topographic navigation.
I don't want people to give copies of the .img file to others.  What do I need to do to distribute this GPS Map so that the file will only work on the specific GPS where it is installed?