IMO this won't be any different than it used to be with the PNA:
The navigation path/Navigations.EXE had to be selected or entered in the configuration of the device.

Correct: with iGO it was usually Mobilenavigator.EXE. Accordingly, the proven Automappa.exe could also be renamed and used as a navigation tool.
!* but if, for example, a Mortscript with SystemInformation was its own start procedure on the SdCard, then it becomes difficult without exact knowledge 😒