Hi Super Grover !
I read your comments, HB navigation flight manual section, real flight manual, articles about gyromagnetic compass on the web, and tests in-game. Now I think I understand pretty well how the whole things are working (IMU, AHRS,...).
Very great and deep system modeling !
Just a last question for you / Victory205 / SME:
After catapult launch, does a fast slave by the HDG push button on compass control panel is a standard procedure ?
Thank you !