In this audio clip released by the Coast Guard, a mayday call-out from two fishermen who fell from an overturned fishing vessel near Cape Elizabeth, Wash., Tuesday, April, 14, 2009, is heard. Using directions provided by the Coast Guard's Rescue 21 system, the helicopter crew was able to fly directly to the scene of the overturned vessel and rescue one unconscious man from the water. (U.S. Coast Guard audio)