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Home > Exam Questions > ATPL - Airline Transport Pilot Licence > Radio Navigation > How did historical Selective Availability affect the public GPS positioning service before it was discontinued in May 2000?

332 - ATPL Question Bank in English - How did historical Selective Availability affect the public GPS positioning service before it was discontinued in May 2000?

Question 332 - Radio Navigation - ATPL - Airline Transport Pilot Licence

It had no effect because receivers could always remove it by choosing different satellites.

It improved accuracy by excluding satellites with less favourable geometry.

It degraded accuracy by switching off selected satellites.

It intentionally degraded public GPS accuracy through manipulated satellite-clock and ephemeris parameters.

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