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What is WAAS?
WAAS, available in North America, is a provider in the worldwide SBAS (Satellite
Based Augmentation System) navigation system. CBAS provides GPS signal correc-
tions to SBAS users, for even better position accuracy, typically better than three
meters. There are two more SBAS providers, MSAS (Multi-Functional Satellite Aug-
mentation System) for Japan and EGNOS (Euro Geostationary Navigation Overlay
Service) for Europe. All providers are compatible with one another, thus providing
seamless position fixes to SBAS users. The illustration below shows the coverage ar-
ea. (Accuracy may be affected when using a GEO satellite not within your current lo-
cation.) This manual uses WAAS for these three providers generically.
Provider Satellite type Longitude Satellite No.
WAAS Inmarsat-3-F4
142
°E
122
Inmarsat-3-F3 (POR)
178
°E
134
Intelsat Galaxy XV
133
°W
135
TeleSat Anik FIR
107.3
°W
138
EGNOS Inmarsat-3-F2 (AOR-E)
15.5
°W
120
Artemis
21.5
°E
124
Inmarsat-3-F5 (IOR-W)
25
°E
126
MSAS MTSAT-1R
140
°E
129
MTSAT-2
145
°E
137
WAAS
MSAS
EGNOS