Question 481 Rules of the Road

90% to pass

INTERNATIONAL ONLY Your vessel is backing out of a slip in a harbor. Visibility is restricted. Which signal are you required to sound?

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

The correct answer is D) one prolonged blast only. According to the International Regulations for Preventing Collisions at Sea (COLREGS), when a vessel is leaving a berth or slip with restricted visibility, the vessel is required to sound one prolonged blast to indicate its intention and position. This signal alerts other vessels in the area that the vessel is backing out and helps avoid potential collisions. The other answer choices are incorrect because they do not align with the COLREGS requirement for a single prolonged blast in this situation. Sounding a combination of prolonged and short blasts, or the danger signal, would not be the appropriate signal in this case.

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