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
View all Garmin GPSMAP 96 manuals
Add to My Manuals
Save this manual to your list of manuals |
Page 134 highlights
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