Appendix 2 What Is Waas - Furuno GP-33 User Manual

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.
EGNOS
Provider
WAAS
EGNOS
MSAS
GAGAN
MSAS
GAGAN
Satellite type
Intelsat Galaxy XV
TeleSat Anik F1R
Inmarsat-4-F3
Inmarsat-3-F2/AOR-E
Artemis
Inmarsat-4-F2
MTSAT-1R
MTSAT-2
Inmarsat-4-F1
WAAS
Longitude
133°W 135
107.3°W 138
98°W 133
15.5°W 120
21.5°E 124
25°E 126
140°E 129
145°E 137
64°E 127
Satellite No.
AP-3