Garmin GPSMAP 96 Owner's Manual - Page 134

What is WAAS?, What is Differential GPS (DGPS)?, the U.S. Department of Defense under their Selective

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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 accuracy to be on the order of 2-3 meters. For more information, Go To http://gps.faa.gov/Programs/WAAS/waas.htm. 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. 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. Location Setup Page (Position Format List with Loran TD selected.) 126 96/96C Owner's Manual

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96/96C Owner’s Manual
A
PPENDIX
>
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
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.)