The aviation transceiver can be tuned to broadcast and  receive on the emergency frequency 121.5 MHz or  any other usable frequency that will elicit a response. The wing can be employed to lay out a prominent  marker to aid recognition from the air by other air- craft. The wing can also be used as an effective  layered garment when wrapped around the body to  conserve body heat or to provide relief from excessive  sunlight.  nal smoke during daylight hours, signal flares, and a  prominent wing display are effective methods. Search and rescue squads (SAR) are particularly  tuned to signals of threes. Hence, three fires arranged  in a triangle, three bangs against a log, or three flashes  of a mirror—all of these will initiate a rapid response  by search and rescue. 12-9