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iv | Raynav 300 GPS Plotter |
Figure i: The WAAS System
Availability of the WAAS System in North America
The WAAS system is presently broadcasting and being tested for aviation use. It is expected to be certified by the FAA in 2002. During this testing and certification period, continuous service is expected; however, brief signal outages may occur as refinements and upgrades are made to the system. The status of WAAS and planned outages are available
http://wwws.raytheontands.com/waas or http://www.raymarine.com
Your unit is shipped from the factory in normal GPS mode. For improved accuracy provided by the WAAS system, you need to enable the WAAS capability of your unit.
➤To enable WAAS:
1.Press the MENU key
2.Press GPS SETUP soft key
3.Press FIX MODE soft key to select SD mode.
Extended Offshore Coverage
Using two GEO satellites, WAAS provides augmented differential GPS coverage for most of North America. Since the WAAS differential messages are broadcast by GEO satellites, the WAAS signals cover a greater area both inland and offshore in comparison with land based DGPS systems. Coverage for North America is shown in Figure ii.