To be fair to Peter, what he is actually saying is the only way to get BRNAV in a light aircraft is with a BRNAV GPS and he is quite correct.
Commercial aircraft are using FMS that are updated from different sources including a DME/DME fix but I have not seen many FMS equipped light aircraft.
VOR/DME
DME/DME
Loran C
Don't quite meet the requirements for BRNAV certification in a light aircraft....