During IFR operations using an approved GPS system for navigation, which statement is true about alternate navigation?

During IFR operations using an approved GPS system for navigation, which statement is true about alternate navigation?

• A. No other navigation system is required.
• B. Active monitoring of an alternate navigation system is always required.
• C. The aircraft must have an approved and operational alternate navigation system appropriate for the route.
• D. Alternates are unnecessary if RAIM is available.

Answer: (C)

Having GPS as the primary IFR navigation option doesn’t relieve you of a backup. You must have an approved and operational alternate navigation system on board that is appropriate for the route. This backup ensures you can continue navigating if GPS becomes unavailable or unreliable, providing a legitimate means to follow the route and reach your destination or alternate airports. RAIM checks help assess GPS integrity, but they don’t eliminate the need for a backup. Even with good RAIM status, GPS outages or degraded accuracy can occur, so a suitable alternate nav source remains required. Active monitoring of the backup system isn’t the point here; the key is that an approved, usable alternative navigation capability is available for the route.

Having GPS as the primary IFR navigation option doesn’t relieve you of a backup. You must have an approved and operational alternate navigation system on board that is appropriate for the route. This backup ensures you can continue navigating if GPS becomes unavailable or unreliable, providing a legitimate means to follow the route and reach your destination or alternate airports.

RAIM checks help assess GPS integrity, but they don’t eliminate the need for a backup. Even with good RAIM status, GPS outages or degraded accuracy can occur, so a suitable alternate nav source remains required. Active monitoring of the backup system isn’t the point here; the key is that an approved, usable alternative navigation capability is available for the route.