N523RV wrote:
Can I not have a simple toggle
switch on the panel to switch between NAV/GPS and let the 89B do all
the annunciation?

Matthew

Without reviewing the requirements, I believe the whole purpose of the
annunciator is to place it within the primary instrument scan. With the
panel mount GPS being presumaby in a radio stack several inches to the
side of the "6 pack", the GPS alone does not meet that placement
requirement. Again, I am only paraphrasing what I believe I've read in
the past, not quoting chapter and verse. I believe there is an AC that
deals with IFR GPS useage that provides one means of compliance.

Look on Ebay.. you might be surprised at what you can come up with.
Also, check out places like Air Salvage of Dallas (www.asod.com, I
think). It doesn't have to be new.

Dave