The worth of the whistle was proven to me decades ago.
Abandoning an offshore
platform for a storm at night, all personnel had been lowered to a crew boat via the crane and personnel basket. The last 2 men
doing the loading had to go down to the boat landing and get on the boat by swinging on a rope
While waiting for the boat to get in place, one of the men
was washed from the landing by a wave. Disappearing in the dark, everyone knew he was a gone pecan.
The crew boat captain
circled to to the lee side of the platform and let the boat drift while everyone scanned the dark water
for the tiny water
activated light sewn on the shoulder of his life vest.
He was one hour in the water and was found because he was blowing the life jacket whistle like a wild man when the boat drifted next to him.