Do you have the same issue if you follow the OP’s steps to reproduce it?
yes
Provide extra information to complete the original description of the issue:
if started on the runway with the classic version, external HUD is locked to GPS CDI. This is wrong since the classic version is not GPS equipped.
if started C&D, external HUD is set to Nav1. It cannot be switched to Nav2 due to another issue reported here:
DC-3 Swap OBS Compass Rose Selector Switch is Toggling NAV Compass Light
If relevant, provide additional screenshots/video: