"Scott Moore" wrote in message =
news:GdKBd.8300$wu4.6369@attbi_s52...
RonLee wrote:
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Does GPS altitude REALLY work?
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Yes, but it does not matter, since wrong or right, baro altitude is =
what
the IFR system uses.
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I can't comment on the 480. It has WAAS, but so will the 480. The 480
has no HSI, but there isn't room for it on the display, and in any =
case,
I have a real HSI, and an electronic HSI cannot emulate a true HSI
in any case.
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Samiam is Scott A. Moore
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WAAS/GPS altitude is used for VNAV approaches.
It works very well, really.
Baro-VNAV is beyond the scope of the CNX80/GNS480.

I'm curious why you say that the 480 has no room for an HSI display.
Have you never seen its NAV page?
I, too, have a "real" HSI in the lower half of my flight director,
but the HSI page in my CNX80 remains useful to me.
As I've posted earlier, the glide-slope needle in my Flight Director
is not driven from the CNX80/GNS480 unless VNAV minima are published.
This defeats autopilot coupling to the computed glideslope on =
non-precision approaches.
However, the HSI display of the NAV page shows vertical guidance
for most LNAV approaches, as a welcome aid for stabilized descents.