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283 - ATPL - In the NAVSTAR/GPS satellite navigation system, re-use of Selective Availability would give the option to artificially degrade the accuracy by:

Question 283 - Radio Navigation - ATPL - Airline Transport Pilot license

Shutting off selected satellites
Dithering the satellite clock
Offsetting satellite atomic clocks by a predetermined constant amount
Using a less accurate atomic clock in a satellite for signal processing

Training tests and timed exam simulations ATPL - Airline Transport Pilot license