How can GPS Overlays be identified on a chart?

GPS Overlays on an approach chart are specifically identified by the addition of the GNSS designation after the NDB (Non-Directional Beacon) identifier. This notation indicates that the approach incorporates Global Navigation Satellite System (GNSS) technology, enabling pilots to use satellite-based navigation in conjunction with traditional navigation aids like NDBs. This is important for pilots as it denotes the capability to perform approach procedures with GPS guidance, emphasizing the integration of modern navigation systems into existing frameworks.

While the other choices may include concepts related to navigation, they do not accurately represent how GPS Overlays are identified on charts. For example, the presence of the word CNAV typically refers to a type of route or air navigation but does not specifically relate to overlay identification. Similarly, different color coding systems might be used in navigation charts for various purposes, but they are not a definitive method for identifying GPS Overlays. Lastly, unique symbols for GPS approaches might exist, but the standardized GNSS indication following the NDB identifier is the specific convention used for clarity in recognizing GPS Overlays.