"Jose" wrote in message
.. .

... and my response addresses exactly that.


No, it addresses the failure of a VOR and the failure of a GPS satellite.



The failure of a single VOR
(or even twenty) won't cripple the VOR system. But the (albeit unlikely)
failure of twenty satellites will cripple the GPS system.


You're right, but you're now comparing the failure of about 0.1 to 2% of the
VOR system to the failure of about 69% of the GPS constellation.