Aero Academic
Aero Academic
A satellite-based surveillance system in which an aircraft broadcasts its own GPS-derived position, altitude, and velocity.
ADS-B (Automatic Dependent Surveillance-Broadcast) is a satellite-based surveillance technology in which an aircraft determines its position using GPS and periodically broadcasts that position, along with altitude, velocity, and other data, so it can be tracked by air traffic control and by other suitably equipped aircraft without relying on traditional radar.
ADS-B Out is the equipment that broadcasts an aircraft's own position; ADS-B In allows an aircraft to receive broadcasts from other aircraft and, via ground stations, free subscription-free weather and traffic data (FIS-B and TIS-B). As of January 2020, 14 CFR 91.225 requires ADS-B Out in most of the airspace that previously required a transponder, including Class B and C airspace and above 10,000 ft MSL over the contiguous United States.
Because ADS-B relies on GPS for its position source, its accuracy and integrity are tied to GPS performance, and FAA knowledge tests expect candidates to know both the equipment requirements and the practical advantage ADS-B In provides: cockpit display of nearby traffic and datalink weather at no subscription cost.