ADS-B is composed of which two services?

The correct answer is that ADS-B is composed of two services: ADS-B Out and ADS-B In. ADS-B, or Automatic Dependent Surveillance–Broadcast, is a surveillance technology that allows aircraft to determine their position via satellite navigation and periodically broadcast it.

ADS-B Out is the service that broadcasts the aircraft's position and other information to air traffic control (ATC) and other nearby aircraft. This data enhances situational awareness and improves safety by allowing ATC and surrounding aircraft to see the aircraft's location, altitude, velocity, and intent, especially in areas not covered by radar.

ADS-B In, on the other hand, allows aircraft to receive information from other aircraft that are broadcasting ADS-B Out. This service provides pilots with enhanced situational awareness by displaying information such as the positions of other ADS-B equipped aircraft, weather data, and other relevant flight information.

Together, these services enhance safety, improve situational awareness, and facilitate more efficient air traffic management. Understanding the distinction and functionality of ADS-B Out and ADS-B In is crucial for pilots and aviation professionals as they adapt to modern aviation systems.