I have tested my emulators.
Garmin runs on NK5, NK6 and WinCE6 Build 1937.
Garmin does not run on PPC_USA and PPC_GER. Both CE5 and CE6.

On my Becker50 with CE6 I get as far as starting Explorer, then it stops. (Paths are corrected)
Que.exe cannot be started.