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eTrex Vista C
Appendix
What is WAAS?
The Wide Area Augmentation System (WAAS) is an F.A.A. funded
project to improve the overall integrity of the GPS signal. It is a space-
based system that broadcasts integrity information and correction data as
determined by ground reference stations (see DGPS below). At this time
the system is still in the developmental stage with a goal of providing
reliable signals with an accuracy of 7 meters (21-22 ft.) both horizontally
and vertically 95% of the time. Current tests have shown the actual ac-
curacy to be on the order of 2-3 meters. For more information, go to
http://gps.faa.gov/Programs/WAAS/waas.htm.
WAAS
eTrex Vista C Owner's Manual Text.indd 90 8/12/2004, 9:18:41 AM