WHEN AND HOW TO SOUND OFF
When two power-driven vessels encounter each other within one half mile, sound signals must be used. The initiating vessel indicates a maneuver, and the responding vessel agrees or disagrees.
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SOUND SIGNALS
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1 short blast (1 second)
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I want to pass you on my portleft hand side of a vessel. side (Hint: PORT = 1 syllable = 1 short blast)
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2 short blasts
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I want to pass you on my starboardright hand side of a vessel. side (Hint: STARBOARD = 2 syllables = 2 short blasts)
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3 short blasts
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Engine is in reverse
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5 short blasts
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Danger, or do not understand approaching boat's intentions
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1 prolonged blast (4-6 seconds)
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Warning:
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Entering or exiting a blind turn
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Nearing an obstructed area
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Leaving a dock or a berth
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1 prolonged blast every 2 minutes
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Power-driven vessel operating in low or restricted visibility
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1 prolonged blast + 2 short blasts every 2 minutes
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Sailing vessel operating in low or restricted visibility
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