Three is the universal signal number for distress.
When you discover you are lost stay where you are. Yell "Help!" or blow a whistle 3 times to signal you are lost. Wait several seconds. Then turn 90 degrees and try again. Keep doing this. If someone yells back, let him come to you. Sometimes echoes may cause you to lose your orientation. Even if someone sounds far away, keep yelling. They may sound this way because they are turned away from you.
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