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.