Designed to use for emergency purpose on lifecraft. NRT-1000 adopts low consumption devices to ensure the product to continuously operate more than 96 hours. The Search and Rescue Radar Transponder (SART) is a 9 GHz receiver / transmitter which provides a position.The fundamental function of the SART is to indicate its position by producing range and bearing information on any 9 GHz radar screen of any nearby ship, vessels and aircraft (with no modification).