Appendix 5 What Is Sbas - Furuno GP-170 Operator's Manual

APPENDIX 5 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.
• America: WAAS (Wide Area Augmentation System)
• Europe: EGNOS (Euro Geostationary Navigation Overlay Service)
• Japan: MSAS (Multi-Functional Satellite Augmentation System)
• India: GAGAN (GPS And GEO Augmented Navigation)
These four systems have interoperability. The illustration below shows the coverage area for each
provider. This manual uses "SBAS" for these four providers generically.
EGNOS
Provider
WAAS
EGNOS
MSAS
GAGAN
GAGAN
Satellite type
Intelsat Galaxy XV
TeleSat Anik F1R
Inmarsat-4-F3
Inmarsat-3-F2/AOR-E
Artemis
Inmarsat-4-F2
SES-5
MTSAT-1R
MTSAT-2
GSAT-8
GSAT-10
WAAS
MSAS
Longitude Satellite No.
133°W
107.3°W
98°W
15.5°W
21.5°E
25°E
5°E
140°E
145°E
55°E
83°E
As of March 6th, 2014
135
138
133
120
124
126
136
129
137
127
128
AP-11