"Ron Rosenfeld" wrote in message
...
On Sat, 28 Aug 2004 08:21:21 -0700, "C J Campbell"
wrote:

No. You can't fly the VOR unless you have VOR on board and the VOR on the
ground is operational. You may substitute WAAS for the VOR if the
approach
has been approved for WAAS.

That is directly contrary to what is in the AIM with regard to overlay
approaches, whether or not WAAS is mentioned.

" h. GPS Approach Procedures

... During these GPS approaches [referring to overlay approaches],
underlying ground-based NAVAIDs are not required to be operational and
associated aircraft avionics need not be installed, operational, turned on
or monitored "


That's an overlay approach, a "VOR or GPS RWY 24" approach, for example.
For an approach like that you don't need a VOR, but you would for a "VOR RWY
24" approach.