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On 22 Jan 2004 19:39:21 -0800, (Mark) wrote:

The drift you get corrected for is
VERY slow moving, so if it had a lock on WAAS data every few minutes
that should be good enough for good correction, shouldn't it?

On a good day, yes, but on a bad day in some parts of the globe
ionospheric propagation delay can change rapidly, to the point of
scintillation.

WAAS isn't global. The footprint is very defined, like any
geostationary satellite.

Larry W4CSC

Is it just me or did the US and UK just capture 1/3
of the world's sweetest oil supply? What idiot wants to
GIVE IT BACK?!!
Let's do what Europeans have been doing for centuries.
DIVIDE UP THE SPOILS OF OUR CONQUEST! Gas will be
$US0.50/US gallon again, STUPIDS!