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126 96/96C Owner’s Manual
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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 accuracy to be on the
order of 2-3 meters. For more information, Go To
http://gps.faa.gov/Programs/WAAS/waas.htm.
What is Differential GPS (DGPS)?
The U.S. and Canadian governments (among others)
have set up Differential GPS (DGPS) stations to
transmit correction signals. They are operational in
coastal areas and on many navigable river systems.
The DGPS system is available for use without fee.
In addition to compensating for errors in position,
these corrections signals can also correct for
deliberate degradation of the accuracy of GPS by
the U.S. Department of Defense under their Selective
Availability (SA) program.
Refer to the U.S. Coast Guard’s web site: http://www.
navcen.uscg.gov/ for locations and the status of the
differential sites. Using DGPS requires additional
equipment.
Location Setup Page
(Position Format List with Loran TD selected.)