On Fri, 22 Aug 2008, Paul Sorenson wrote:
> Depends a lot upon what GPS unit he's relying upon. I certainly
> wouldn't try it with my Garmin Etrex. ;>}
>
> OTOH, a friend, to whom I give instrument dual instruction occasionally,
> has an auto-pilot coupled Garmin, certified for vertical guidance,
> installed in his Comanche. You can let the electronics shoot an
> approach down to 200 ft and it's right on the money.
>
> -p
>
That's the difference right there. A WAAS VNAV-certified GPS has
a specific approach programmed into it relative to the GPS-derived
altitude solution. That's a whole different beast than comparing
indicated pressure-derived altitude to just general GPS-derived altitude
while in cruise.
-Cory
--
*************************************************************************
* Cory Papenfuss, Ph.D. Electrical Engineering, PPSEL-IA *
* Research Associate, Vibrations and Acoustics Laboratory *
* Mechanical Engineering *
* Virginia Polytechnic Institute and State University *
*************************************************************************
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