What is the first action after detecting GPS signal loss?

What is the first action after detecting GPS signal loss?

• A. Cross-check with backup navigation sources
• B. Continue with GNSS
• C. Reboot GNSS receiver
• D. Switch to VOR only

Answer: (A)

When GPS signal is lost, the immediate step is to rely on independent navigation sources to determine your position and keep the flight on a safe path. Cross-checking with backup navigation sources such as VOR/DME, ADF, and, if available, inertial/navigation systems helps confirm your actual position and course, reducing the risk of drift or misinterpretation from a single source being unreliable. This approach preserves situational awareness while you assess the cause of the loss and decide on a plan, including how to re-acquire GPS or switch navigation modes. Rebooting the GNSS receiver may be attempted later if a fault is suspected, but it doesn’t address the need for reliable position information right away. Continuing to rely on GNSS without a valid signal is unsafe, and switching to VOR only is something you do once you’ve established a solid backup position using other sources.

When GPS signal is lost, the immediate step is to rely on independent navigation sources to determine your position and keep the flight on a safe path. Cross-checking with backup navigation sources such as VOR/DME, ADF, and, if available, inertial/navigation systems helps confirm your actual position and course, reducing the risk of drift or misinterpretation from a single source being unreliable. This approach preserves situational awareness while you assess the cause of the loss and decide on a plan, including how to re-acquire GPS or switch navigation modes. Rebooting the GNSS receiver may be attempted later if a fault is suspected, but it doesn’t address the need for reliable position information right away. Continuing to rely on GNSS without a valid signal is unsafe, and switching to VOR only is something you do once you’ve established a solid backup position using other sources.