WbBiggles
Take a deep breath mate and read the initial post - it is about NDB overlay approaches. You don't need geostationary satellites to do them. The TSO'd approach capable GPS equipment that is widely available in aircraft in Oz can be used to fly an NDB overlay approach NOW.
The only impediment is the regulators!
If faced with flying an NDB approach in anger, I would copy the airline boys and girls and let George handle it on the GPS, while monitoring the "raw" data from the ADF - to comply with my legal obligations. Thats how I do the three NDB approaches I fly each year for currency purposes - leaving the one I do each year for my IR renewal as the only one I fly soley by the raw data. This compares with the, on average, 2 x GPSRNAV and 2 x ILS apprs I fly each month.
The only reason for having an ADF in an aeroplane these days is to cover some alternate requirements.
Dr 
PS:
Wally, was it a TSO'd GPS that lost all the satellites - or a portable?