Definition
The receiving side of ADS-B. ADS-B In is the function and equipment in an aircraft that receives ADS-B signals broadcast by other aircraft and ground stations, allowing the cockpit to display traffic information (TIS-B) and free graphical and textual weather and aeronautical information (FIS-B) on suitable cockpit displays.
Plain English
It is the part of the ADS-B system that listens. It pulls in signals from other aircraft and from ground stations so the pilot can see nearby traffic and free weather information in the cockpit.
Context Anchor
Seen in NextGen, cockpit traffic displays, moving-map displays, and discussions of aircraft equipment for traffic and weather awareness.
Derivation
"In" simply means inbound — signals coming into the aircraft. It is paired with ADS-B Out, which is the broadcasting side. Together they describe whether the aircraft is sending information, receiving it, or both.
Why Pilots Care
Gives pilots real-time traffic and weather awareness without relying solely on ATC, supporting better separation decisions and reduced workload.
Analogy
It is like a car receiving traffic information on a navigation screen. The screen can help you understand what is around you, but it does not drive the car or make decisions for you.
Intuition Check
Do not confuse ADS-B In with ADS-B Out. ADS-B In receives information; ADS-B Out sends your aircraft’s position and other data.
Example Sentence 1
With ADS-B In installed, the pilot could see nearby traffic on the cockpit display before ATC called it out.
Example Sentence 2
With ADS-B In active, the cockpit showed weather ahead and allowed the pilot to request a route deviation.