The S4 Rescue SART offers proven reliability. Extremely simple to use the S4 Rescue can be operated even with gloved or wet hands. Its compact design makes it ideally suitable for packing in liferafts or as a carry off device according to SOLAS regulations. The S4 Rescue is a 9GHz X-band Radar transceiver and has been designed for assisting air/sea ship or survival craft rescue operations in accordance with IMO, GMDSS requirements. When a radar signal is received from a ship or aircraft, the S4 Rescue automatically transmits a response signal, which clearly identifies the survival craft on the radar screen by means of a stream of 12 in-line dots.