What does it mean when a GPS Overlay is referenced?

When a GPS Overlay is referenced, it indicates approaches that are specifically coded for GPS guidance. This means that the approach procedure has been designed to utilize the Global Positioning System for navigation during the approach and landing phases, ensuring precise lateral and vertical navigation performance. This allows pilots to receive guidance based on the GPS signals for executing standard instrument approaches, improving safety and accuracy during the approach to landing.

This kind of overlay can enhance situational awareness, especially in conditions where traditional navigation aids may not be available or are less effective. The coding for GPS guidance incorporates specific waypoints, altitudes, and approach paths that airports have published in their approach plates.

Understanding the use of GPS overlays is crucial for pilots operating under instrument flight rules, as it directly impacts their navigation capabilities and approach procedures. This knowledge can help ensure that they follow the appropriate approaches and utilize GPS as a reliable navigational aid effectively.