In addition to duplicating the functions of a mode C transponder, an aircraft's mode S transponder can also provide:

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Multiple Choice

In addition to duplicating the functions of a mode C transponder, an aircraft's mode S transponder can also provide:

Mode S adds selective addressing and richer data to the transponder, which allows other aircraft and air traffic systems to identify and track a given airplane more precisely. This extra information enables collision avoidance systems, such as TCAS, to determine potential threats and issue resolution advisories to pilots. So the capability that Mode S provides beyond simply duplicating Mode C is mid-air collision avoidance capabilities. Primary radar surveillance is provided by ground radar, not by Mode S transponder data alone. Long-range lightning detection isn’t a transponder function, and backup VHF voice communication is a separate radio system, not part of mode S transponder capabilities.

Mode S adds selective addressing and richer data to the transponder, which allows other aircraft and air traffic systems to identify and track a given airplane more precisely. This extra information enables collision avoidance systems, such as TCAS, to determine potential threats and issue resolution advisories to pilots. So the capability that Mode S provides beyond simply duplicating Mode C is mid-air collision avoidance capabilities.

Primary radar surveillance is provided by ground radar, not by Mode S transponder data alone. Long-range lightning detection isn’t a transponder function, and backup VHF voice communication is a separate radio system, not part of mode S transponder capabilities.

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