Furuno GD-1700, Operator'S Manual

Page: 14 / 249

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
150
°
W 120
°
W 90
°
W 60
°
W 30
°
W 0 30
°
E 60
°
E 90
°
E 120
°
E 150
°
E
0
20
°
S
40
°
S
60
°
S
20
°
N
40
°
N
60
°
N
0
20
°
S
40
°
S
60
°
S
20
°
N
40
°
N
60
°
N
WAAS
EGNOS
MSAS
Satellite, Region Position
120, AOR-E
15.5
°
W
122, AOR-W 54
°
W
131, IOR 64.5
°
E
134, POR 178
°
E
131
134
122 120
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.