Which system utilizes the transponder information?

The use of transponder information is central to the operation of TCAS, or Traffic Collision Avoidance System. TCAS is designed to enhance the safety of air travel by providing pilots with information about nearby aircraft. It utilizes transponder signals emitted by other aircraft to calculate their position, altitude, and trajectory.

By processing this transponder data, TCAS assesses whether there is a potential for mid-air collisions and issues alerts and advisories to the pilots. This system plays a crucial role in preventing accidents in crowded airspace. In contrast, while GPS, FMS (Flight Management Systems), and ADF (Automatic Direction Finder) have their specific functions related to navigation and flight management, they do not rely on transponder information. Instead, GPS uses satellite signals, FMS integrates various navigation aids, and ADF uses radio frequencies for navigation. Thus, TCAS stands out as the system that explicitly utilizes the transponder information for its operation.