Furuno 1833, 1943, 1933 manual What is WAAS?, Xii

WHAT IS WAAS?

WAAS, available in North America, is a provider in the worldwide SBAS (Satellite Based Augmentation System) navigation system. SBAS provides GPS signal corrections to SBAS users, for even better position accuracy, typically better than three meters. Two more SBAS providers are also currently under development, MSAS (Multi-Functional Satellite Augmentation System) for Japan and EGNOS (Euro Geostationary Navigation Overlay Service) for Europe. All providers will be compatible with one another, thus providing “seamless” position fixes to SBAS users. The illustration below shows the coverage area. (Accuracy may be affected when using a GEO satellite not within your current location.)

150￿W	120￿W	90￿W	60￿W	30￿W	0	30￿E	60￿E	90￿E	120￿E	150￿E
60￿N											60￿N
40￿N							EGNOS			MSAS	40￿N
20￿N											20￿N
0				122	120		131			134	0
	WAAS
20￿S											20￿S
40￿S											40￿S
60￿S											60￿S
150￿W	120￿W	90￿W	60￿W	30￿W	0	30￿E	60￿E	90￿E	120￿E	150￿E

Satellite, Region	Position
120, AOR-E	15.5 W
122, AOR-W	54￿W
131, IOR	64.5￿E
134, POR	178￿E

Initial operation time

WAAS: 2003

EGNOS: 2004

MSAS: 2005

At the time of this software release, SBAS is still under development (Providers are expected to have initial operations capability from the times shown above.) During this developmental period, which may last for several years, there is no guarantee of the accuracy, integrity, continuity, or availability of the SBAS signal. Furuno will accept no responsibility for the use of the signal for other than the above stated purpose. It is the user's responsibility to exercise common prudence and navigational judgment while using the SBAS signal. Users are reminded that the SBAS has not been commissioned for use in safety of life applications (SOLAS) and must be turned to the "OFF" position on any SOLAS vessels.

xii