Well assumingly
NaviPnd.dll and navi_pch.exe on the SD card are the actual navigation software, maybe this can be debugged (looks like some kind of embedded version of Windows)
On a virgin SD these files are stored under the /Garmin directory.
called
EU-E1.gma
EU-E1.unl
.
.
.
EU-E12.gma
EU-E12.unl
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