"C J Campbell" writes:

I might point out that VORs are also inoperative at certain time in
certain regions. The Mc Chord VOR has not worked in over a year,
despite it being an important airway intersection. So what are you
suggesting we use for backup navigation systems for the VOR?

Redundancy. In the continental U.S., you have an extremely dense VOR
system, so that you will usually be in reception range of quite a
few other VORs and can easily navigate even without radar vectors; in
Canada, we have a parallel system of NDB airways to accomplish
basically the same thing.

If Galileo ever gets running, you can have that kind of redundancy for
satellite-based navigation as well.


All the best,


David

--
David Megginson, , http://www.megginson.com/