I would say that we are exceedingly fortunate in having Nav Canada as an
information source to supplement (complement?) the FAA.

Bob Gardner

"David Megginson" wrote in message
...
"John Bell" writes:

Let me add two links to the discussion:

This is on problems with cold weather altimetry:

http://www.aircraftbuyer.com/learn/train06.htm

This is about the accuracy of unaided GPS altitude in the context of
vertical guidance, but it bears some relavence to the discussion of the
accuracy of GPS altitude:

http://www.bluecoat.org/reports/Graham_2001_RawGPS.pdf

Thanks -- those are good articles. The Nav Canada paper on non-WAAS
GPS VNAV (the Graham paper) is especially interesting.


All the best,


David