Question 3433 Deck General

The correct answer is A) vessel. According to the International Regulations for Preventing Collisions at Sea (COLREGS), a non-self-propelled mobile offshore drilling unit under tow is considered to be a vessel. This is because the COLREGS define a vessel as "every description of water craft, including non-displacement craft and seaplanes, used or capable of being used as a means of transportation on water." Since the non-self-propelled mobile offshore drilling unit is being towed and used as a means of transportation on water, it meets the definition of a vessel under the COLREGS. The other answer choices are incorrect because a non-self-propelled mobile offshore drilling unit under tow is not a non-displacement vessel (B), a power-driven vessel (C), or a limited vessel (D). It is simply considered a vessel under the COLREGS.