When flying RNAV-only routes, what must be monitored?

When flying RNAV-only routes, what must be monitored?

• A. Gnss integrity
• B. Airspeed deviation
• C. Weather conditions
• D. Terrain clearance

Answer: (A)

RNAV-only routes depend entirely on GNSS for accurate position information, so the essential thing to monitor is the integrity of the GNSS data. You must keep a close watch on the receiver’s integrity status (RAIM/FDE availability, alert flags, SBAS/augmentations such as GAGAN) to ensure the navigation solution remains trustworthy. If GNSS integrity cannot be guaranteed, continue the flight using alternative navigation methods or a conventional route. While airspeed, weather, and terrain clearance are important for overall safety, they are not the specific requirement tied to maintaining RNAV navigation—GNSS integrity is what keeps the RNAV path reliable.

RNAV-only routes depend entirely on GNSS for accurate position information, so the essential thing to monitor is the integrity of the GNSS data. You must keep a close watch on the receiver’s integrity status (RAIM/FDE availability, alert flags, SBAS/augmentations such as GAGAN) to ensure the navigation solution remains trustworthy. If GNSS integrity cannot be guaranteed, continue the flight using alternative navigation methods or a conventional route. While airspeed, weather, and terrain clearance are important for overall safety, they are not the specific requirement tied to maintaining RNAV navigation—GNSS integrity is what keeps the RNAV path reliable.