noblues:
Does anyone know on the B744 (or probably the same on other Boeing's) if the Hdg switch is left True twill he aircraft fly a coupled approach OK?
I can't speak specifically to any Boeing aircraft in this respect, but the concept is to use true heading source when using true ILS or VOR IAPs.
The rub comes in for the guys who go to those airports that don't have IRUs or true AHRs.