What should not be relied upon for navigation?

When considering navigation in a King Air 350, it's important to understand the various systems available and their reliability. The correct answer points to the Terrain Awareness Display. This system is designed primarily for situational awareness regarding terrain and potential obstacles, helping to prevent controlled flight into terrain (CFIT).

While the Terrain Awareness Display is a valuable tool for enhancing safety by providing pilots with real-time information about nearby terrain, it is not designed as a primary means of navigation. Instead, its purpose is to alert pilots to impending terrain conflicts and assist in visualizing terrain appropriately.

In contrast, the GPS system, Flight Management System, and Air Traffic Control are integral components of navigation. The GPS provides precise location data, the Flight Management System organizes and integrates various navigation inputs for optimal route management, and Air Traffic Control offers guidance and instructions that help pilots navigate safely and efficiently within controlled airspace. Therefore, among these options, the Terrain Awareness Display cannot be relied upon solely for navigation, as it serves a different, yet complementary, role in the overall navigation process.