http://www.cbc.ca/m/rich/news/story/2011/07/28/wdr-pilot-treads-water-before-rescued.html

The story of a pilot whose plane crashed into Lake Huron on Tuesday. He tread water for 18 hours before being rescued by a passing boater.

I don't think I've ever thought of waving my socks to attract rescue. Smart thinking! Not having his PLB and/or cel phone on his body, not so smart.

A whistle sure would have come in handy!