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Home > Exam Questions > ATPL - Airline Transport Pilot Licence > Radio Navigation > Which statement about a ground-based augmentation system (GBAS, formerly called LAAS) is correct?

272 - ATPL Question Bank in English - Which statement about a ground-based augmentation system (GBAS, formerly called LAAS) is correct?

Question 272 - Radio Navigation - ATPL - Airline Transport Pilot Licence

GBAS cannot correct common satellite-clock or orbital-position errors.

GBAS residual accuracy is independent of propagation conditions and the separation between aircraft and reference receivers.

GBAS relays its local differential corrections to aircraft via a geostationary satellite.

Nearby surveyed reference receivers measure GNSS errors for local corrections; residual accuracy depends on spatial decorrelation and other error sources, so being closer does not by itself guarantee a more accurate fix.

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