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SYSTEM OVERVIEW
The GP-320B is a GPS receiver with WAAS (Wide Area Augmentation System) capability.
WAAS, available in North America, is a provider in the worldwide SBAS (Satellite Based
Augmentation System) navigation system. An SBAS provider furnishes 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.
SBAS is currently in the developmental phase and SBAS providers are expected to have
initial operations capability from the times shown below. During the developmental phase
the reliability and availability of the SBAS signal cannot be guaranteed.
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
Expected operations capability
WAAS: 2003
EGNOS: 2004
MSAS: 2005
Note: Unless otherwise noted, this manual uses “WAAS” when referring to any SBAS
provider.