The SART (Search And Rescue Transponder) is designed to assist in the rescue and recovery of liferafts and survival craft. The SART is normally stowed in the liferaft ready for any emergency. Once the unit is turned on it sits in standby, conserving power until it is automatically activated by the signal sweep of an X-band Radar of a passing vessel. The radar will then instantly display a straight line of 12 dots on the radar screen. Identifying to the ships crew that there is a survival craft within 100metres of the last dot.