Question 117Navigation General70% to pass
Which topmark shown in illustration D023NG below identifies an isolated danger?
AI Explanation
The correct answer is B.
The topmark shown in illustration D023NG that identifies an isolated danger is a single black sphere. This is in accordance with the International Association of Lighthouse Authorities (IALA) Maritime Buoyage System, which specifies that an isolated danger mark should display a single black sphere as the topmark.
The other answer choices do not correctly identify the topmark for an isolated danger mark. A, C, and D represent different topmarks used for other types of navigational marks, such as cardinal marks or safe water marks, but not for isolated danger marks.
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