Filter
Top Products
AP-3
APPENDIX 2 WHAT IS WAAS?
WAAS, available in North America, is a provider in the worldwide SBAS (Satellite Based Augmen-
tation System) navigation system. CBAS provides GPS signal corrections to SBAS users, for even
better position accuracy, typically better than three meters. There are three more SBAS providers,
MSAS (Multi-Functional Satellite Augmentation System) for Japan, EGNOS (Euro Geostationary
Navigation Overlay Service) for Europe and GAGAN (GPS And GEO Augmented Navigation) for
India. The illustration below shows the coverage area. (Accuracy may be affected when using a
GEO satellite not within your current location.) This manual uses “WAAS” for these three providers
generically.
Provider Satellite type Longitude Satellite No.
WAAS Intelsat Galaxy XV 133°W 135
TeleSat Anik F1R 107.3°W 138
Inmarsat-4-F3 98°W 133
EGNOS Inmarsat-3-F2/AOR-E 15.5°W 120
Artemis 21.5°E 124
Inmarsat-4-F2 25°E 126
MSAS MTSAT-1R 140°E 129
MTSAT-2 145°E 137
GAGAN Inmarsat-4-F1 64°E 127
WAAS
MSAS
EGNOS
GAGAN