Thread: *.gma - What's inside?!

Originally Posted by Swall

For me, it seems the GMA mechanism is designed to facilitate many usage scenarios and it's up to map vendor which one to choose.

GMA was designed to counter forged unlock codes obtained using JetMouse's keygen.

Originally Posted by Swall

While in another scenario, the .gma file just supersedes the unlocking code file ( .unl), not "validates" it.

It's not like that.
GMA file of course contains unlock codes, the validity of which is confirmed by a digital signature in the file. The main thing in this file is a valid signature.

Here's the official Overview by Garmin:

Code:

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