But this was the difference between two GPS altitudes, both reporting that
they had WAAS receptivity.

"Ron Rosenfeld" wrote in message
news
On Sun, 27 Jun 2004 04:49:52 GMT, "Wyatt Emmerich"
wrote:

Interesting. Could you elaborate?

On what?

If you look through the NOAA site (especially the ngs pages) and also
GOOGLE the topic, you'll find lots of information on altitude standards.

The FAA site has information on TSO146 and WAAS.

I know that here in the NE, a few hundred feet discrepancy between baro
altitude and GPS altitude is not unusual with a TSO146 box.


Ron (EPM) (N5843Q, Mooney M20E) (CP, ASEL, ASES, IA)