Question 3388 Deck General

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Which shape shown in illustration D016RR below would be displayed by a mobile offshore drilling unit that is being towed more than 200 meters astern of a towing vessel?

Diagram for USCG Deck General: Which shape shown in illustration D016RR below would be displayed by a mobile...
A A
B B
C C
D D
AI Explanation

The correct answer is B. According to the International Regulations for Preventing Collisions at Sea (COLREGS), a mobile offshore drilling unit (MODU) being towed more than 200 meters astern of a towing vessel must display two all-round white lights in a vertical line. This lighting configuration corresponds to the shape shown as option B in the illustration. The other options are incorrect because they do not match the COLREGS requirements for a MODU being towed more than 200 meters astern. Option A would be for a vessel being towed, option C for a vessel not under command, and option D for a vessel constrained by her draft.

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