If you're out in the wilderness with only one or two other people, it's easy to get separated. Even worse, if you planned for the trip to be "all natural" and decided not to bring any electronic gadgets like TVs and cells phones, then there are no lines of communication between you and your buddies.
To make sure you can alert your friends of your whereabouts, watch this video to see how to make a whistle from a small piece of willow twig.
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