GPS Approach: Understanding the LNAV/VNAV Flag

What does it mean when the GPS/HSI shows an LNAV/VNAV flag?

When the GPS/HSI displays an LNAV/VNAV flag during a GPS approach, what action should be taken?

Answer:

The LNAV/VNAV flag in a GPS approach is a warning of a navigation issue or system problem, indicating potential issues with vertical guidance.

On a GPS approach, the GPS/HSI showing an LNAV/VNAV flag is an important indication that should not be ignored. It signifies a potential problem with the vertical navigation aspect of the approach. When encountering this flag, immediate checks should be performed to ensure the safety of the flight.

The LNAV/VNAV flag stands for Lateral Navigation/Vertical Navigation. In the context of a GPS approach, it serves as a cautionary warning to the pilot that there may be issues with vertical guidance. Ignoring this flag could lead to unsafe conditions during the approach.

To address the LNAV/VNAV flag, pilots should conduct thorough checks on the system, GPS signal, and flight path. Any anomalies or discrepancies should be resolved before proceeding with the approach. By taking proactive measures to address the warning, pilots can maintain the safety and integrity of the flight operation.

It is crucial for pilots to be familiar with the significance of the LNAV/VNAV flag and take appropriate action when it appears during a GPS approach. By understanding and responding to this warning indicator, pilots can ensure a safe and efficient navigation process.