Question 448 Rules of the Road

90% to pass

INTERNATIONAL ONLY Your vessel is backing out of a slip in a harbor and you can see that other vessels are approaching. You should sound which of the following signals?

A One prolonged blast followed by three short blasts when the last line is taken aboard
B The danger signal
C One prolonged blast only
D Three short blasts when leaving the slip
AI Explanation

The correct answer is D) Three short blasts when leaving the slip. According to the International Regulations for Preventing Collisions at Sea (COLREGS), a vessel that is backing out of a slip or berth should sound three short blasts to indicate its intention to do so. This allows other vessels in the area to be aware of the backing maneuver and take appropriate action to avoid a collision. The other options are incorrect because they do not align with the COLREGS requirements for this specific situation. The danger signal (option B) would only be used to indicate the need for immediate action, and the other blast patterns (options A and C) are not the correct signals for a vessel backing out of a slip.

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Official Resources
USCG Navigation Rules (COLREGS) 33 CFR Navigation Rules USCG Navigation Center
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