AP-5
APPENDIX 3 WHAT IS SBAS?
A satellite-based augmentation system, or SBAS (Satellite Based Augmentation System), is an
augmentation system that uses additional messages from satellite broadcasts to support regional
and wide area augmentation. SBAS provides GPS signal corrections to SBAS users, for even bet-
ter position accuracy, through the GPS error corrections that are widely broadcasted from the geo-
stationary satellite.
SBAS is used in America, Europe, Japan and India. These four systems; WAAS, EGNOS, MSAS
and GAGAN, have interoperability. The illustration below shows the coverage area for each pro-
vider. This manual uses "SBAS" for these four providers generically.
Provider Satellite type Longitude Satellite No.
WAAS
(Wide Area Augmentation System,
America)
Intelsat Galaxy XV 133°W 135
TeleSat Anik F1R 107.3°W 138
Inmarsat-4-F3 98°W 133
EGNOS
(Euro Geostationary Navigation
Overlay Service, Europe)
Inmarsat-3-F2/AOR-E 15.5°W 120
Artemis 21.5°E 124
Inmarsat-4-F2 25°E 126
SES-5 5°E 136
MSAS
(Multi-Functional Satellite Aug-
mentation System, Japan)
MTSAT-1R 140°E 129
MTSAT-2 145°E 137
GAGAN
(GPS And GEO Augmented Navi-
gation, India)
GSAT-8 55°E 127
GSAT-10 83°E 128
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