Transponder Mandatory Zone (TMZ)

A Transponder Mandatory Zone (TMZ) is a defined area where carrying and using a transponder transmitting the barometric altitude of the aircraft’s altimeter is mandatory.

The pilot must set the published TMZ code in the transponder before flying into a TMZ. In addition, the pilot must listen to the corresponding published frequency and be available for two way voice communication at all times.

With friendly permission of DFS Deutsche Flugsicherung GmbH. Not to be used for navigational purposes!