An RFID tag consists of a tiny radio transponder; a radio receiver and transmitter. SECOR used ground-based transmitters from known locations that sent signals to satellite transponder in orbit. NASA distinguishes between a "transceiver" and "transponder". The coupling's location can be clearly identified by the RFID transponder coding. A unique 24-bit identifier is assigned to each aircraft that has a mode S transponder. INSAT-3D payloads include Imager, Sounder, Data Relay Transponder and Search & Rescue Transponder. Using triangulation, an enemy could determine the location of the transponder. Each car has an active transponder with a unique ID code. These smaller wings also housed the antennae of the transponder. The Small Deep Space Transponder (SDST) is a compact and lightweight radio-communications system. ANPR can be used in conjunction with transponder systems. The system also has provisions for transferring arbitrary data both to and from a transponder. The incident was a misunderstanding caused by a malfunctioning transponder and translation error. Transponder, and the Flightcom 403 intercom. It took rescuers three hours to find the wreckage using the plane's transponder.