If an aircraft is using an alternate type of navigation aid due to RAIM unavailability, what is the pilot's primary concern?

When an aircraft is using an alternate type of navigation aid due to RAIM (Receiver Autonomous Integrity Monitoring) unavailability, the pilot's primary concern is the safety of the flight. This situation often indicates that the primary navigation system, which may rely on GPS, is not functioning correctly or cannot provide the necessary assurance of position accuracy.

In aviation, safety is always the foremost priority. If RAIM is unavailable, pilots must ensure they are using reliable navigation aids to maintain control over the aircraft and ensure safe navigation, especially in critical phases like departure, approach, or landing. While efficiency, compliance with air traffic control instructions, and minimizing operational costs are also vital considerations for flight operations, they do not take precedence over safety. In uncertain navigation scenarios, ensuring that the aircraft is safely routed and that the pilots have reliable situational awareness is crucial to prevent accidents or incidents.