IFF Transponder

Identification friend or foe (IFF) is a system used by Knightmare Frames and airships, it broadcasts a signal, that is encoded on a specific channel, which transmits information regarding location, direction and unit type. It allows for tacticians to actively see the battlefield. This system can be a double edged sword, as demonstrated by Lelouch, when the IFF information is used by the enemy. An IFF transponder can be removed, though the exact process is unknown.