Furuno GP-1640, Operator'S Manual

Page: 9 / 96

vii
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.
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.
Note: This manual uses “WAAS” when referring to any SBAS provider.