Question 18

The Correct Answer is A **Explanation for A (A vessel constrained by her draft):** Rule 28(b) of the International Regulations for Preventing Collisions at Sea (COLREGs) specifies the lights for a vessel constrained by her draft. Such a vessel shall, in addition to the lights prescribed for a power-driven vessel of the same length, exhibit **three all-round red lights in a vertical line** where they can best be seen. These three vertical red lights signify the restriction in maneuvering capability due to draft limitations. **Explanation of why other options are incorrect:** * **B) A vessel moored over a wreck:** A vessel engaged in diving operations or mooring over a wreck might display the prescribed lights for a vessel restricted in its ability to maneuver (three all-round lights in a vertical line: Red-White-Red), or perhaps lights/shapes indicating obstruction (if applicable), but not three all-round red lights specifically. * **C) A vessel aground:** Rule 30(d) states that a vessel aground shall exhibit the lights prescribed for an anchoring vessel (forward: all-round white light; aft: all-round white light), and in addition, **two all-round red lights in a vertical line** where they can best be seen. This is only two red lights, not three. * **D) A vessel dredging:** A vessel engaged in dredging or underwater operations is classified as a vessel restricted in its ability to maneuver (Rule 27). Such a vessel exhibits three all-round lights in a vertical line: Red-White-Red. It will also exhibit two all-round red lights to indicate the obstructed side and two all-round green lights to indicate the side on which another vessel may pass (if there is an obstruction). It does not display three vertical red lights.