APPENDIX
AP-4
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 provides 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
At the time of this software release, only WAAS is operational. During the developmental
period in other areas, 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.
