Interestingly this may have ramifications for some of the smaller operators of medium jets (early A320's and 737 Classics), as most of those are not GPS-equipped, and (I'm told) are not a simple process to retrofit. Admittedly this is only a small number of aircraft, but would limit a few operators.
The Norfolk NDB is one of the strongest I know, and at night can be received with a strong ident and bearing from west of Coffs Harbour.