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FAA certified GPS for use over the ocean yet interference has been experienced precluding the use of GPS. Why is such a system certified?

April 26, 2017certified experienced FAA GPS interference ocean precluding system

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FAA certified GPS for use over the ocean yet interference has been experienced precluding the use of GPS. Why is such a system certified?

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A. “GPS avionics used for primary means of oceanic operations have built in Receiver Autonomous Integrity Monitoring (RAIM) functions to provide integrity of navigation. Integrity is the notification of Hazardously Misleading Information (HMI). In the remote circumstance of a loss of the integrity function, flight crews can use backup procedures to insure safe navigation until the RAIM function is restored.