"Mike Rapoport" wrote in message
k.net...
Recently the COE VOR was notamed OTS. Coincedent with this the KSZT
LOC/DME
was notamed NA. The explanation given was that the COE VOR was nessasary
to
fly the tranition (COE is the IAF) and the missed approach (the missed
ends
with a hold at the COE VOR). I contend that GPS can substitute for the
VOR
but I can't find it witten down anywhere. The KSZT LOC, DME and ADF are
all
working properly. Our question is: Was the KSZT LOC/DME approach
improperly NOTAMed NA? Can you cite a source? Remember we are talking
about substituting GPS for the VOR to fly the transition, we are not
talking
about substituting for the LOC.

AIM 1-1-19 says:
f. Use of GPS in lieu of ADF and DME

1. Subject to the restrictions below, operators in the U.S. NAS are
authorized to use GPS equipment certified for IFR operations in place of ADF
and/or DME equipment for en route and terminal operations. For some
operations there is no requirement for the aircraft to be equipped with an
ADF or DME receiver, see subparagraphs f6(g) and (h) below. The ground-based
NDB or DME facility may be temporarily out of service during these
operations. Charting will not change to support these operations.

---------------------------------------------

There is no provision for GPS to be used in lieu of VOR. 1-1-20 addresses
the use of WAAS. WAAS eliminates the requirement for backup navigation
systems and may be used stand-alone. You may, of course, use GPS to navigate
to a location that happens to be a VOR, just as you may use GPS to navigate
to any other point, but if you have no VOR you cannot use it for an
approach. If you have WAAS you may use it for any approach authorized for
WAAS (these approaches are annotated as such) and need no ground radios at
all.