Question 877 Rules of the Road

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BOTH INTERNATIONAL & INLAND Which is the duration of each prolonged blast on whistle signals used by a power-driven vessel in fog, whether making way or underway but not making way?

A about one second
B two to four seconds
C four to six seconds
D eight to ten seconds
AI Explanation

The correct answer is C) four to six seconds. According to the International Regulations for Preventing Collisions at Sea (COLREGS), the duration of each prolonged blast on the whistle signal used by a power-driven vessel in fog, whether making way or underway but not making way, should be four to six seconds. This regulation is stated in Rule 35(a) of the COLREGS. The other options are incorrect because a one-second blast (option A) would be considered a short blast, while options B (two to four seconds) and D (eight to ten seconds) do not match the four to six second duration specified in the regulations.

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