(Michael) wrote a lot of excellent stuff. I saved
a bit for response.

Michael: I appreciate your response, both for the extent that you
clearly thought it out, and for the time you took. I find your points
reasonable, and I accept it completely.

regarding: "3x redundant? Do you mean you have 3 fully independent
electrical
busses? Or at least two? My electrical system includes 2 generators
(which, because they don't require power to the field, will keep
working if the battery and/or master contactor fail) and a battery -
but only a single bus. I still keep a yoke-mounted GPS with backup
batteries..." Same deal here. Two separate
busses/batteries/generator/alternator (one of each) and a panel-mount
(velcro) handheld running off the airplane's batteries but with about
30 minutes of life when they are done. That's treble redundancy in my
book.

As far as my point on the moving maps, we are likely saying the same
thing differently, but if you fail my EFIS, the CNX 80 is going to
present its information as a map. If you fail my CNX 80, the EFIS is
going to present ITS information as a map. If you fail both, the
handheld is going to ...yep, a map. By map, I mean a graphic
representation of what I need to do next.

I don't have a separate OBS/resolver. It is unnecessary since the CNX
80 is certified to TSO C146a. It does have a built-in navcom, but
without the HSI, I have no needles to follow. It does, however,
present a graphical representation (map) on its screen.

I've actually saved a bit of panel space to put that extra set of
needles in if it becomes obvious that I need it.

Truth be told, I am still shaking my system down, and have not/will
not go into the soup until I am convinced that I am not missing
something. At this point, I am 99.9% convinced that I am NOT missing
something.

Thanks again for the well thought out reply.

Jim