What method is used to verify RAIM?

The verification of Receiver Autonomous Integrity Monitoring (RAIM) is essential to ensure that GPS signals being used for navigation are reliable. This method focuses on utilizing GPS detection, which involves assessing the integrity of the GPS signal by processing information from multiple satellites. When a sufficient number of satellites are available, the system can identify faulty signals.

Additionally, referencing NOTAMs (Notices to Airmen) is important as they provide real-time updates on the status of navigational aids, including GPS availability and any relevant changes in the airspace that might affect GPS accuracy. Flight Service Stations (FSS) offer further information and updates that pilots can use to verify the status of the navigation system.

This combination of GPS data, NOTAMs, and FSS communications creates a comprehensive method to ensure the integrity of the navigation information being used, aligning with the necessary safety standards for IFR operations.