What is the difference between ADSB Out and ADSB In?

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https://www.thebalancecareers.com/what-s-the-difference-between-ads-b-out-and-ads-b-in-282562

https://en.wikipedia.org/wiki/Automatic_dependent_surveillance_%E2%80%93_broadcast?wprov=sfti1

Automatic dependent surveillance—broadcast (ADS–B) is a surveillance technology in which an aircraft determines its position via satellite navigationand periodically broadcasts it, enabling it to be tracked. The information can be received by air traffic control ground stations as a replacement for secondary surveillance radar, as no interrogation signal is needed from the ground. It can also be received by other aircraft to provide situational awareness and allow self-separation.

 ADS–B is "automatic" in that it requires no pilot or external input. It is "dependent" in that it depends on data from the aircraft's navigation system.

 Using "ADS-B Out", each aircraft periodically broadcasts information about itself, such as identification, current position, altitude and velocity, through an onboard transmitter. ADS-B Out provides air traffic controllers with real-time position information that is, in most cases, more accurate than the information available with current radar-based systems. With more accurate information, ATC will be able to position and separate aircraft with improved precision and timing.

 "ADS-B In" is the reception by aircraft of FIS-B and TIS-B data and other ADS-B data such as direct communication from nearby aircraft.



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