OK, an interesting lesson on supposedly crappy airliner avionics (I would have my two VOR receivers adjusted if they were more than 1 degree out on the 30 day FAA mandatory VOR check; it is a simple matter of getting an IFR4000 tester and removing one of the four fixing screws) but I don't see the connection with PRNAV improving things for ATC because the aircraft must be BRNAV approved and you cannot do that with just VOR receivers.
My comment about AIDS research was flippant, GWYN
Just referring to how many people would be out of a job if the problem was ever solved.