[FLWSS] WAAS

[George Presley]

Some questions have been asked about how accurate the hand-held units are
with the WAAS feature. I know I can't fool my unit when I walk around on my
property. Today, when I Google Earth a very visible point in my yard and
compare it with my hand-held GPS, the two were within 8 ft. of each other.

Here also is a statement from www.answers.com

Accuracy

The WAAS specification requires it to provide a position accuracy of 7.6
meters or better (for both lateral and vertical measurements), at least 95%
of the time. Actual performance measurements of system at specific locations
have shown it typically provides better than 1.0 meters laterally and 1.5
meters vertically throughout most of the contiguous United States and large
parts of Canada and Alaska.[2] With these results, WAAS is capable of
achieving the required Category I precision approach accuracy of 16 m
laterally and 4.0 m vertically. 

Additional info:

Definition of: WAAS

(Wide Area Augmentation System) A satellite system that improves the
location tracking accuracy of the GPS system from 20 meters to three meters.
Deployed in 2003, WAAS comprises a group of earth stations and two
satellites that cover North America. The earth stations track the GPS
satellites and send correction signals to the WAAS satellites, which are
picked up by WAAS-enabled navigation systems.

George K4RSV