What is the primary purpose of a GPS Overlay?

The primary purpose of a GPS Overlay is to provide lateral guidance with GPS. A GPS Overlay, often referred to as a GPS approach, works in conjunction with existing instrument approach procedures, allowing pilots to use GPS equipment to navigate laterally to the desired runway and approach path. This capability enhances situational awareness for pilots by offering a precise path to follow, which is particularly helpful when navigating through areas where traditional ground-based navigation aids may be sparse or unavailable.

By utilizing a GPS Overlay, pilots can accurately follow a defined lateral course toward the runway based on GPS signal, which enhances their ability to execute the approach, maintaining alignment with the intended trajectory. This approach offers increased flexibility and precision compared to traditional navigation methods, thereby streamlining operations in both IFR and visual conditions.

The alternatives do not focus on this essential aspect of using GPS for lateral course guidance. While VOR approaches and autopilot navigation may relate to other facets of navigation, they don’t reflect the specific utility of using GPS overlays in enhancing the accuracy of lateral guidance during approaches. The mention of safety during visual approaches also diverts from the core functional aim of GPS Overlays concerning lateral guidance in instrument approaches.