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Yellow enclosed-cabin gyroplane in flight against a clear blue sky

Glossary

What is a transponder?

A radio unit that replies to ground radar with the aircraft's identity and altitude. Most ADS-B Out installations are built around an existing transponder, adding the broadcast function to it, and most aircraft flying in controlled airspace carry one regardless of ADS-B equipage.

That is the whole entry for now. The longer version, with the mechanics and worked examples, is still to be written. See autorotation for how those read once they exist.

All glossary terms