3. ______: a whistle is a powerful signalling tool due to its high-pitched sound that carries over long distances. Always carry a whistle when venturing into the wilderness. If lost, blow the whistle in short, distinct bursts, spaced evenly. The sound will attract attention, and its repetitive nature will distinguish it from natural sounds. If you don't have an emergency whistle, use a metal object, strike it against a rock to make a loud, metallic noise.

Emergency whistle: a whistle is a powerful signalling tool due to its high-pitched sound that carries over long distances. Always carry a whistle when venturing into the wilderness. If lost, blow the whistle in short, distinct bursts, spaced evenly. The sound will attract attention, and its repetitive nature will distinguish it from natural sounds. If you don't have an emergency whistle, use a metal object, strike it against a rock to make a loud, metallic noise.