Question 664 Rules of the Road

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BOTH INTERNATIONAL & INLAND Which shape must be shown by a vessel 25 meters in length aground during daylight hours?

A One black ball
B Two black balls
C Three black balls
D Four black balls
AI Explanation

The correct answer is C) Three black balls. According to the International and Inland Navigation Rules (Rule 30), a vessel 25 meters or more in length that is aground must display three black balls in a vertical line during daylight hours. This signifies that the vessel is aground and not under command, alerting other vessels to the situation and the need to avoid the area. The other answer choices are incorrect because a single black ball (A) or two black balls (B) would not be the proper signal for a vessel 25 meters or more in length that is aground, and four black balls (D) would be the signal for a vessel that is not under command for reasons other than being aground.

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