Garmin GPSMAP 60 Owner's Manual

Also see for GPS 60 - Hiking GPS Receiver: Quick start guide Owner's manual Release note Declaration of conformity Quick start guide

Contents

Garmin GPSMAP 60 Owner's Manual Manual pdf 88 page image

78GPSmap 60AppendicesWAAS and DGPS What is WAAS?The Wide Area Augmentation System (WAAS) is an F.A.A. fundedproject to improve the overall integrity of the GPS signal. It is a space-based system that broadcasts integrity information and correction data asdetermined by ground reference stations (see DGPS below). At this timethe system is still in the developmental stage with a goal of providingreliable signals with an accuracy of 7 meters (21-22 ft.) both horizontallyand 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 tohttp://gps.faa.gov/Programs/WAAS/waas.htm.What is Differential GPS (DGPS)?The U.S. and Canadian governments (among others) have set upDifferential GPS (DGPS) stations to transmit correction signals. They areoperational in coastal areas and on many navigable river systems. TheDGPS system is available for use without fee.In addition to compensating for errors in position, these correctionssignals can also correct for deliberate degradation of the accuracy of GPSby 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 requiresadditional equipment.