You can read more about Garmin GMA files and digital certificates for authentication of Garmin maps with MapIDs >= 2200. Most forum user are already acquainted with GMA protection since it's implementation around January 2010 so it's not explained further in map threads.
[Only registered and activated users can see links. ]
[Only registered and activated users can see links. ]
If you use the JM KG make sure that it's the one with corrected calculation for the ckecksum.
[Only registered and activated users can see links. ]
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