Automatic Dependent Surveillance–Broadcast (ADS-B) is an avionics system that allows aircraft to be tracked by broadcasting position and identification information.
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ADS-B is used for aircraft surveillance and tracking in airspace management.
ADS-B includes two complementary functions: ADS-B Out, which broadcasts an aircraft's position, and ADS-B In, which receives position information from other aircraft and services.
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The two functions enable both transmission and reception of surveillance information for situational awareness.
The U.S. military can obtain waivers that exempt its aircraft from ADS-B equipage or usage requirements.
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Waivers can allow military aircraft to operate without using mandated surveillance equipment in certain circumstances.