What is the outcome if RAIM is lost during a flight?

If RAIM (Receiver Autonomous Integrity Monitoring) is lost during a flight, the accuracy of the GPS navigation is no longer assured. RAIM is a function that ensures the integrity of the GPS signals being received. When RAIM is functioning properly, it monitors the GPS signals for anomalies and confirms that the data being used for navigation is reliable. If RAIM is lost, it indicates that the system can no longer verify the integrity of the navigation data, which could potentially lead to incorrect positional information being used.

This situation is critical because GPS is often relied upon for both navigation and precision approaches. Therefore, if RAIM is lost, pilots must be cautious, as their navigation information may not be trustworthy. While other options may suggest actions to take during this scenario, the primary concern is the reliability of the navigational data. Understanding the importance of RAIM is essential for instrument flight operations and ensuring safety in navigation.