Question 18

The Correct Answer is A. A vessel constrained by her draft (Option A) is required by the International Regulations for Preventing Collisions at Sea (COLREGs), Rule 28, to display three all-round red lights in a vertical line in addition to the lights required for a power-driven vessel underway. This configuration of three all-round red lights stacked vertically specifically indicates that the vessel is restricted by its draft and cannot deviate easily from its course. **Why the other options are incorrect:** * **Option B (A vessel moored over a wreck):** A vessel moored over a wreck is typically considered a vessel "engaged in underwater operations" (or related activities like surveying). It would display all-round lights indicating its restricted ability to maneuver (two all-round lights, red over white), and potentially two all-round green lights to indicate which side to pass, but not three vertical red lights specifically for being constrained by draft. * **Option C (A vessel aground):** A vessel aground displays the lights for a vessel at anchor (forward and aft anchor lights) and, in addition, two all-round red lights in a vertical line where they can best be seen (COLREGs Rule 30(d)). It does not display three vertical red lights. * **Option D (A vessel dredging):** A vessel engaged in dredging is considered a vessel restricted in its ability to maneuver (COLREGs Rule 27(b)). It displays two all-round lights, red over white, and often two all-round red lights on the side where the obstruction exists, and two all-round green lights on the side where another vessel may pass. It does not display three vertical red lights.