Ors,
The Storm whistle is in the boating section.  While you are there look in the sporting goods area and pick up a copy of "The Pocket Survival Guide" by J. Wayne Fears.  It is about $5.00.  You can't miss it.  It is bright orange and is 4.5" x 6.5".  Keep it in a quart size Ziploc bag.   
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Thermo-regulate, hydrate and communicate.