I completed my IR in my Archer which was all steam gauges except for a Garmin 150 which wasn't certified. This was only possible because at that time RNAV wasn't compulsory below FL095.
I therefore flew lots and lots of NDB procedures and holds with no decent tools at all and all of it hand flown with the screens up.
The fact that I can do this doesn't make it a good thing. It also illustrates that UK IR training bears as much relationship to real world IFR flying as a course on coastal sailing does.
Those old boys flying NDB procedures in air liners weren't trying to meet PRNAV accuracy levels either!
Nope if I lose the GPS I'll get vectors and SRA thanks and if it wasn't a legal requirement to carry one the ADF would not be using valuable panel space.