>>All those NDB, TACAN and the odd VOR approach we used to fly on the basic RMI would be forbidden....<<
And therein goes the proficiency.
I recall years ago flying across Bulgaria in a 707, and was doing some manual loop/180 degree ambiguity bearings on a couple of NDB's along the route.
The First Officer had no idea about any of this, but the navigator we had along (positioning) began to explain...and the F/O's eyes started to glaze over...
