If a RAIM alert is received, may you continue to use GPS on approach?

If a RAIM alert is received, may you continue to use GPS on approach?

• A. True
• B. False
• C. Not enough information
• D. Only with additional equipment

Answer: (B)

RAIM is the integrity check for the GPS system. It ensures that the satellite geometry and data allow a trustworthy position solution throughout the approach. When a RAIM alert is received, the system cannot guarantee the GPS position or its integrity for the ongoing approach. Because an instrument approach relies on accurate, continuous position information to fly the procedure safely, you should not continue to rely on GPS for the approach. The prudent action is to switch to a non-GPS navigation method (or abort and proceed via alternate means) rather than persisting with GPS guidance.

RAIM is the integrity check for the GPS system. It ensures that the satellite geometry and data allow a trustworthy position solution throughout the approach. When a RAIM alert is received, the system cannot guarantee the GPS position or its integrity for the ongoing approach. Because an instrument approach relies on accurate, continuous position information to fly the procedure safely, you should not continue to rely on GPS for the approach. The prudent action is to switch to a non-GPS navigation method (or abort and proceed via alternate means) rather than persisting with GPS guidance.