Question 18 ONC07 - OUPV-Near Coastal

The Correct Answer is A **Explanation for Option 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 exhibit, in addition to the lights prescribed for a power-driven vessel of the same length, **three all-round red lights in a vertical line** where they can best be seen. Therefore, sighting three red lights in a vertical line dead ahead at night indicates a vessel constrained by her draft. **Why the other options are incorrect:** * **B) A vessel moored over a wreck:** There is no specific requirement in COLREGs for a vessel moored over a wreck to display three red lights in a vertical line. If the wreck itself is marked by the vessel, the vessel would typically display anchor lights (or lights appropriate to a vessel at anchor), and possibly the wreck itself may be marked by lights/buoys as per IALA recommendations, but not the three vertical red lights. * **C) A vessel aground:** Rule 30(d) of COLREGs specifies that a vessel aground must display the lights for a vessel at anchor, and in addition, **two all-round red lights in a vertical line** where they can best be seen. It displays two, not three, vertical red lights. * **D) A vessel dredging:** A vessel engaged in dredging (or underwater operations, as part of a vessel "restricted in her ability to maneuver" - Rule 27) displays three lights in a vertical line: **Red, White, Red** (R-W-R). The lights indicate the side on which the obstruction lies (two vertical red lights) and the side on which another vessel may pass (two vertical green lights). It does not display three vertical red lights.