Question 18 GLI05 - Master or Mate of LT 200 GRT

The Correct Answer is A **Explanation for Option A (A vessel constrained by her draft):** Rule 28 of the COLREGs (International Regulations for Preventing Collisions at Sea) specifies the lights for vessels constrained by their draft. A vessel constrained by her draft shall exhibit, in addition to the lights prescribed for a power-driven vessel underway (masthead lights, sidelights, and sternlight), **three all-round red lights in a vertical line**. This configuration of three red lights signifies the vessel is constrained by the maximum depth of water and cannot deviate from its course easily. **Explanation for Incorrect Options:** **B) A vessel moored over a wreck:** A vessel engaged in diving or underwater operations (which might include mooring over a wreck) would typically display three all-round lights in a vertical line: **red, white, red**. It does not display three red lights. **C) A vessel aground:** A vessel aground displays the lights for a vessel at anchor (an all-round white light or lights), and in addition, it must display **two all-round red lights in a vertical line** where they can best be seen. It does not display three red lights. **D) A vessel dredging:** A vessel engaged in dredging or underwater operations (vessel engaged in fishing, or in a towing operation which severely restricts the towing vessel and her tow in their ability to deviate from their course) displays lights indicating restricted maneuverability. A vessel restricted in its ability to maneuver displays **three all-round lights in a vertical line: red, white, red**. Furthermore, when dredging, it also displays two all-round red lights in a vertical line on the side on which an obstruction exists and two all-round green lights in a vertical line on the side on which another vessel may pass. It does not display three all-round red lights alone.