Question 474 Rules of the Road

90% to pass

INTERNATIONAL ONLY Which whistle signal may be sounded by one of two vessels in sight of each other?

A One short, one prolonged, and one short blast
B One prolonged blast
C Four short blasts
D One short blast
AI Explanation

The correct answer is D) One short blast. According to the International Regulations for Preventing Collisions at Sea (COLREGS), one short blast on the whistle is the signal that may be sounded by one of two vessels in sight of each other to indicate "I intend to leave you on my port side". This is a common maneuvering signal used to communicate the intended action of a vessel. The other answer choices are incorrect because they do not represent the standard whistle signal for this specific maneuvering situation between two vessels in sight of each other under the COLREGS rules.

Related Questions
Q736:BOTH INTERNATIONAL & INLAND In illustration D023RR below item "A" represents the... Q461:INTERNATIONAL ONLY On open water, a power-driven vessel coming up dead astern of... Q317:INLAND ONLY At night, which lights are required on barges moored in a group form... Q811:BOTH INTERNATIONAL & INLAND What lights must be shown on a barge being towed ast... Q510:BOTH INTERNATIONAL & INLAND Which light(s) are required to be exhibited by a 20-...

Ready to test your knowledge?

Take a Rules of the Road Practice Exam
Official Resources
USCG Navigation Rules (COLREGS) 33 CFR Navigation Rules USCG Navigation Center
← Previous Question All Questions Next Question →

Pass Your Coast Guard Licensing Exams!

Study offline, track your progress, and simulate real exams with the Coast Guard Exams app

Download on App Store Get it on Google Play Download for Mac