La DFS utilise le mode S sur les EDDF-EDDM

Since 2 March 2009, the Mode S has been used in operations at the DFS control centres Munich and Langen for flights between Frankfurt and Munich. Instead of the Mode 3/A code, aircraft are now assigned the fixed conspicuity code A1000. In addition, the 7-digit aircraft identification as entered manually by pilots appears on the radar screen to correlate flight plan and aircraft.

Each aircraft is assigned a unique, fixed 24-bit address that is used for tracking targets. Installing Mode S significantly reduces the radio frequency congestion because the continuous “all call” interrogations by radar and the replies by all Mode 3/A transponders are no longer necessary. Instead, Mode S data can be requested and displayed via a selective “roll call”. This greatly increases the detection accuracy and eliminates garbling.