About WAAS (Wide Area Augmentation System)
WAAS is a GPS navigation system with differential correction by means of geostationary satellites. Similar systems, using Satellite-Based Augmentation Systems (SBAS), are under development in Japan (MSAS: MSAT Satellite-based Augmentation System) and Europe (EGNOS: European Geostationary Navigation Overlay System). They are said to be fully interoperable and compatible. As the WAAS utilizes the same frequency as the GPS, a single antenna can receive GPS and WAAS signals. Currently two Inmarsat GEO satellites are available for receiving the WAAS signal: AOR-W and POR. Major contributors of an error in a single frequency GPS system are receiver clock drift and signal delays by refraction. The WAAS reference stations on the earth monitor the GPS constellation and route GPS error data to the satellites via the master earth station. The Inmarsat or communication satellite broadcasts the differential corrections to marine and aviation users.
Furuno WAAS/GPS Navigator  The unit has a waterproof display and is built to stand up to tough marine conditions. This durable casing houses an impressive memory, capable of storing up to 1,000 points of ship's track, 999 points for marks and waypoints, and 50 routes of up to 30 waypoints each. Vital navigation data is presented on a 4.5-inch diagonal Silver Bright LCD screen with adjustable brilliance. Innovative graphic displays include Nav, Highway, Steering, Track Plotting, and two operator programmable modes, all extremely easy to use.
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