Onboard GPS OFF Mod
This mod turns off the onboard GPS in all cabs where fitted.
This mod should work with all mod trucks that have an internal GPS too. (not guaranteed though because some mods can contain edited gps.sii files that may conflict with or override this one)
If you are using a mounted GPS mod (like for the original Actros or the Renaults) then that too will most likely not work or the two mods will conflict resulting in the last loaded mod to override the other.
Place the .scs in your mod folder and check the tickbox in Edit Profile in-game.
To re-activate the GPS again simply in game goto Profiles > Edit Profile and uncheck the tickbox for Onboard_GPS_OFF.scs