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Distress signal
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=== Unusual or extraordinary appearance === When none of the above-described officially sanctioned signals are available, attention for assistance can be attracted by anything that appears unusual or out of the ordinary, such as a [[Jib|jib sail]] hoisted upside down. During daylight hours when the sun is visible, a [[heliograph]] mirror can be used to flash bright, intense sunlight. Battery-powered laser lights the size of small flashlights (electric torches) are available for use in emergency signaling.
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