Question 281Navigation General

70% to pass

A List of Lights entry (L Fl) is a single flashing light which shows a long flash of not less than _______________.

A 1.0 second duration
B 1.5 seconds duration
C 2.0 seconds duration
D 3.0 seconds duration
AI Explanation

The correct answer is C) 2.0 seconds duration. According to the United States Coast Guard's Navigation Rules and Regulations Handbook, a List of Lights (L Fl) entry represents a single flashing light that must show a long flash of not less than 2.0 seconds duration. This standard is specified in the International Association of Lighthouse Authorities (IALA) Maritime Buoyage System, which is the system used in the United States. The other options are incorrect because 1.0 second (A) and 1.5 seconds (B) are less than the required 2.0 seconds, and 3.0 seconds (D) is longer than the minimum duration.

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