G Farris wrote:

I disagree. I think there is a more important problem. If you're flying
direct
routes and RNAV with GPS as primary(and only random route) source of
navigation, in the event of a GPS signal degradation, you have a bit of a
balancing act to do to get back to "legacy" navigation. If you're in the
middle of the Great Plains that's no issue, but if you're shooting an
approach
to White Plains it may be.

Wouldn't you be in the same situation if you were shooting an ILS
approach and the localizer went U/S?

Not at all. The missed approach is part of the procedure, and if you've done
good you have it all dialled-in, briefed and ready to fly. No transitioning to
do.

The the missed for a GPS overlay approach uses a ground-based navaid,
then you still have it dialed in and ready to go; if the missed for a
ground-based-navaid approach uses the same navaid, then you still have
a problem.


All the best,


David