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Q: What sound signal alerts other when a boat is backing up?
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What sound signal alerts others a boat is backing up?

3 short blasts


What sound signal alerts others that a vessel is backing up?

3 short blasts


What sound alerts other that a boat is backing up?

3 short blasts


What sound signals alerts other that boat is backing up?

Three short blasts means that the ship's engine is working in reverse.


What sound signal alerts others that a vessel is docking?

loud


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One is the hydrophone, used to pick up sound waves underwater.


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What sound alerts others that a vessel is leaving the dock?

one prolonged blast


What causes a knocking sound when backing a car?

If it only happens when backing up, you may have the parking brake engaged.


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What does Ralph use to signal any other boys who survived?

Ralph uses the conch shell to signal any other boys who survived. The sound of the conch shell represents order and authority, making it a recognizable signal for the boys to gather.