I always remember the 'limitation' which applied to one F-4 aircraft I once flew:
"Autopilot must be used with caution. May cause random +4G pitch moments"
I don't think anyone ever used the autopilot in the F-4 even when it was allegedly serviceable. Even on the few occasions we flew airways.
I don't think we had ADF, let alone GPS. Just INS and TACAN.