Question 311Navigation General

70% to pass

Of the four light characteristics shown in illustration D019NG below which one does NOT represent a safe water mark of the IALA Buoyage System?

Diagram for USCG Navigation General: Of the four light characteristics shown in illustration D019NG below which one...
A A
B B
C C
D D
AI Explanation

The correct answer is A. The IALA Buoyage System defines four primary light characteristics: fixed, flashing, occulting, and isophase. Option A, which depicts a fixed light, does not represent a safe water mark in the IALA Buoyage System. Safe water marks are typically indicated by a white light with a red sector or a white light with a green and red sector. The other options, B (flashing), C (occulting), and D (isophase), can represent safe water marks in the IALA Buoyage System.

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