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Automatic Dependent Surveillance-Broadcast (also called ADS-B) is a system by which airplanes constantly broadcast their current location, type of aircraft, airspeed, flight number, and whether the aircraft is turning, climbing or descending. This information is received by other pilots and flight controllers who are within about 150 nautical miles (278 km).
The purpose of the system is to reduce the risk of collisions between airplanes, as well as to reduce congestion by allowing for more effective management of air traffic.
The ADS-B system was developed in the 1990s. It relies on data from the Global Positioning System.
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