You merely need to carry a working ADF.
I think here is where the confusion coming from. I was writing about whether or not you still needed (legally) a working ADF on board when you have a GPS. The AIM-table in 1-1-19 is about what kind of GPS that needs to be (i.e. panel mounted IFR approved) in order
to do away with the ADF altogether or to fly with an inop ADF when executing an NDB or NDB/DME procedure.
I have flown NDB procedures in the UK on an N-reg having such an IFR approved mounted panel GPS without an ADF onboard. Is that in violation of a regulation ?
Compared to a GPS, the ADF will do little more than to confirm you are pointing at say Gatwick and not Manston
I hope we all agree on that.