If you get lost, don’t rely on your voice—endless screaming tires you out and the woods can muffle sound. And don’t fall victim to a faulty flare, either. Instead, focus on signal tools that have at least three types of signals (audio, visual, and electronic), and Coghlan’s Six-Function whistle ($12, rei.com) will cover two of your bases. Aside from emitting a piercing sound, it also has an LED light and reflective mirror.
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