What is the main advantage of using Mode S radar over traditional radar systems?

The main advantage of using Mode S radar over traditional radar systems is that it can provide detailed data for selected flights. Mode S radar is an advanced surveillance technology that allows for the identification of individual aircraft through a unique transponder code, known as the ICAO address. This transponder communicates information such as the aircraft's altitude, speed, and even its flight intentions directly to ground control.

This capability enhances situational awareness for air traffic controllers, allowing them to receive more precise information about the specific aircraft being tracked. It also enables selective interrogation, meaning that the system can request and receive data from only those aircraft that are relevant for a particular air traffic control situation, improving efficiency and effectiveness in managing airspace.

Other radar systems may lack this level of specificity and data richness, making Mode S particularly valuable in busy airspace where maintaining safety and efficiency is crucial. Using this information can streamline operations and improve safety measures for both the aircraft and air traffic control personnel.