Thank you, Butters.
I admit I am very late to the party and am trying to learn what you already know, and information of this type is not easy to come by.
Are 'Regions' just a term for different 'sections' of the device firmware file?
I would be ever so grateful for a crash course in what 'regions' are, what types exist, how they are used, etc. etc.
Here are the logo.bin from the GPSMAP 66 firmware and the image extracted with GIR, which does not appear correctly,
Spoiler: logo.bin