Question 279Navigation General

70% to pass

The light characteristic of composite group flashing (2 + 1

A A
B B
C C
D D
AI Explanation

The correct answer is D. The light characteristic of a composite group flashing (2 + 1) is D. This means the light flashes two short flashes followed by one long flash, repeating in that pattern. This light characteristic is defined in the International Association of Lighthouse Authorities (IALA) maritime buoyage system, which is the standard used for navigation lights and markers in the United States. The other options (A, B, C) do not match the (2 + 1) flashing pattern described in the question.

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