Navigation General · GPS & GNSS
WAAS (and similar SBAS) improves GPS accuracy by:
- ABroadcasting correction signals via geostationary satellites to reduce position error✓ Correct
- BIncreasing the number of satellites launched
- CTurning off selective availability
- DMeasuring water depth
Explanation
A satellite-based augmentation system such as WAAS uses ground reference stations to compute corrections (for ionospheric and orbit/clock errors) and broadcasts them via geostationary satellites, improving accuracy to a few meters in the coverage area.
Authority: GPS augmentation; WAAS/SBAS
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