What is ADS-B in?

ADS-B stands for Automatic Dependent Surveillance-Broadcast and is a system used in aviation to transmit and receive the position of aircraft. It allows aircraft to automatically and regularly send their GPS position and other data, improving safety and efficiency in airspace. Receivers on the ground or in other aircraft can receive and use these signals to obtain a precise picture of the location of nearby aircraft. Observing and tracking these signals can be an interesting aspect of the hobby, allowing air traffic to be monitored in real time.