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When ship wrecks, the communication equipment will fail after power outages ,the people on board can not be issued a distress signal at the wreck. And the emission signal method only firing flares,the method is single.
Another way is to put a rescue whistle in the life buoy.In addition to the basic function of a whistle,“Life buoy + rescue whistle” also install a ultrasonic signal device in the whistle.
Usually,people is very weak after drowning and they don’t need spend more power to blew his whistle.The rescue boat and helicopter could detect the ultrasonic to find the peple.