wrote in :

Not so. VOR is still the primary means of navigation in the NAS.
Even the latest and greatest airline aircraft with dual GPS sensors,
dual FMSes, triple IRUs, etc, cannot be dispatched without operate VOR
receivers (in their case two).

The presumption is that the GPS system can fail at any time; at least
in a given area. WAAS doesn't mitigate that whatsoever.

Not only airliners - I have to have 2 (not just one, but 2) operable VORs
to dispatch offshore, where there are precisely zero VOR transmitters,
and I'm almost always out of range of any VOR. But both VORs have to be
operable to dispatch IFR.

Ain't bureaucracy wonderful?

--
Regards,

Stan

"They that can give up essential liberty to obtain a little temporary
safety deserve neither liberty nor safety." B. Franklin