Which electronic system is crucial for navigation in aircraft?

The Global Positioning System (GPS) is crucial for navigation in aircraft because it provides precise location and time information anywhere on Earth, regardless of weather conditions. This satellite-based navigation system enables pilots to determine their exact position, speed, and direction of flight, which is essential for safe and effective navigation. By utilizing multiple satellites, GPS can provide accurate readings that are vital for flight planning, route tracking, and ensuring compliance with air traffic control instructions.

While the Flight Management System typically incorporates GPS data to aid in navigation and flight planning, GPS itself is the fundamental technology enabling accurate positional tracking. The autopilot system functions to control the aircraft based on inputs from navigation systems, and while radar can assist in detecting the terrain and other aircraft, it does not provide the same level of precise positional data as GPS does. Therefore, of all the options, GPS stands out as the primary electronic system essential for navigation in aircraft.