Which IFF/SIF code includes an enhanced feature that allows for automatic reporting of platform location?

Mode S is the correct answer because it incorporates advanced features that enhance surveillance capabilities compared to other modes, particularly the ability to report flight information automatically. This includes not only identification data but also the aircraft's precise location through the use of Automatic Dependent Surveillance–Broadcast (ADS-B) technology. Mode S transponders communicate more specific information to ground stations and other aircraft, enabling better situational awareness and more efficient air traffic management.

While Mode C provides altitude reporting and Mode A transmits an aircraft identification code, neither offers the same comprehensive data-sharing capabilities that Mode S does. Mode B, which is less commonly used, does not have the sophisticated features found in Mode S. Therefore, Mode S is uniquely positioned to facilitate automatic reporting of platform location, enabling improved safety and operational efficiency in air traffic management.