It is a search and rescue radar transponder.freqency 9.2 to 9.5ghz.in sar operation when intercepts with x band radar signal it transmits signals which helps in homing purpose.

SART is a device used for distress in maritime. works on X-band radars. (works on 9.2-9.5 GHz) this device is not detected on a S-Band Radar... it transmits a signals if an interrogating Radar is within 5-7 nautical miles from the unit. some says up to 8 Nm.

elevation of device is a factor on it's efficiency. it must be at least 1 meter high for a better performance. if located in a higher position, the range of this device greatly improves