DGPS MAX

most consumer-level applications, a small amount of multipath istolerable.The quality of a GPS receiver has a dramatic influence on positioningaccuracy. Consumer-based GPS products, such as many affordablehandheld and fixed-mount receivers, typically operate with an accuracyof 3 to 5 meters horizontally 95% of the time. The accuracy of aparticular product depends on the specific receiver’s performancecharacteristics. Higher accuracy GPS receivers are able to achieve upto 1 meter of horizontal accuracy 95% of the time using real-timeDGPS transmissions.1.5 DGPS MAX DGPS ServicesThe DGPS MAX receiver is able to use differential correctionsreceived through the internal WAAS demodulator, beacon receiver, orthe OmniSTAR DGPS Service. This section describes the signal anddata content of all three DGPS services available for use with theDGPS MAX receiver.1.5.1 Wide Area Augmentation System (WAAS)The US Federal Aviation Administration is in the process of developinga Wide Area Augmentation System (WAAS) for the purpose ofproviding accurate positioning to the aviation industry. In addition toproviding a high quality, accurate service for this industry, this serviceis available free of charge to all other civilian users and markets inNorth America.Other government agencies are in the process of developing similar,compatible systems for their respective geographic regions. InEurope, the European Space Agency, the European Commission, andEUROCONTROL are jointly developing the European GeostationaryOverlay System (EGNOS). In Japan, the MTSAT Satellite-basedAugmentation System (MSAS) is in progress of development by theJapan Civil Aviation Bureau (JCAB). These compatible augmentationsystems fall into a broader category often referred to as Space BasedDGPS MAX Reference Manual 6