Radar transponders
As part of the safety equipment and rescue some ships are required to Carrying one or several radar transponders.
A transponder is a radar capable of being detected by radar (sea, air and land) Feature emitting a signal indicating the position on the radar screen, by achieving 12 striped device.
They may also be referred radar transponder, with name The defined by the International Telecommunications Organization, and also under the acronym SART.