If Receiver Autonomous Integrity Monitoring (RAIM) capability is lost in flight, what should the pilot be aware of?

When Receiver Autonomous Integrity Monitoring (RAIM) capability is lost during flight, it means that the system can no longer validate the accuracy and integrity of the GPS-derived position information. Consequently, the pilot has no assurance of the accuracy of the GPS position, which is crucial for safe navigation and maintaining situational awareness. Without RAIM, the pilot cannot trust that the position data being displayed is reliable, which could lead to incorrect altitude, heading, or location information.

In contrast, reliable altitude information is critical for safety, and pilots should only depend on GPS-derived altitudes if they can assure their integrity. Therefore, the inability to guarantee the accuracy of the GPS position directly impacts navigation decisions and safety protocols, making awareness of this limitation essential for the pilot's operational strategy.