Question 18

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 display, 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. **Explanation for Incorrect Options:** * **B) A vessel moored over a wreck:** A vessel engaged in diving or mine clearance operations (which might be over a wreck) displays three all-round lights in a vertical line, but the colors are usually red-white-red. A vessel simply moored over a wreck would typically just display anchor lights, unless they are engaged in special operations. * **C) A vessel aground:** A vessel aground displays the lights for a vessel at anchor (forward all-round white light, and stern all-round white light if over 50 meters), and in addition, **two** all-round red lights in a vertical line. It does not display three red lights. * **D) A vessel dredging:** A vessel engaged in dredging or underwater operations (a type of vessel restricted in her ability to maneuver, or WIG) displays three all-round lights in a vertical line: red-white-red. It does not display three all-round red lights.