Filter
Top Products
vii
WHAT IS WAAS?
WAAS, available in North and South America mainly, 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. There are two more SBAS providers, MSAS (Multi-Functional Satellite
Augmentation System) and EGNOS (Euro Geostationary Navigation Overlay Service). All
providers are compatible with one another, thus providing seamless position fixes to SBAS
users. The illustration below shows the coverage area of the SBAS. (Accuracy may be
affected when using a GEO satellite not within your current location.) This manual uses
WAAS for these three providers generically.
WAAS
MSAS
EGNOS
Provider Satellite type Longitude Satellite No.
Inmarsat-3-F4 142°E 122
Inmarsat-3-F3 (POR) 178°E 134
Intelsat Galaxy XV 133°W 135
WAAS
TeleSat Anik FIR 107.3°W 138
Inmarsat-3-F2 (AOR-E) 15.5°W 120
Artemis 21.5°E 124
EGNOS
Inmarsat-3-F5 (IOR-W) 25°E 126
MTSAT-1R 140°E 129 MSAS
MTSAT-2 145°E 137
.