Question 18 ONC04 - Mate of LT 500-1600 GRT

The Correct Answer is A ### 1. Why Option A ("A vessel constrained by her draft") is correct. According to the International Regulations for Preventing Collisions at Sea (COLREGs), Rule 28(b), a vessel constrained by her draft (CBD) may, in addition to the lights for a power-driven vessel underway, display **three all-round red lights in a vertical line**. This signal indicates that the vessel's movement is severely restricted by the water depth in relation to its size, and it requires other vessels to give it extra room and respect its limitations. *** ### 2. Why the other options are incorrect. * **B) A vessel moored over a wreck:** A vessel engaged in operations that might involve being moored over a wreck is generally considered Restricted in her Ability to Maneuver (RAM). A RAM vessel displays three all-round lights in a vertical line: **red-white-red**. Three all-round red lights are not the prescribed signal. * **C) A vessel aground:** A vessel aground displays the lights for a vessel at anchor (an all-round white light forward and aft) AND **two all-round red lights** in a vertical line where they can best be seen (Rule 30(e)). Not three red lights. * **D) A vessel dredging:** A vessel engaged in dredging is a vessel Restricted in her Ability to Maneuver (RAM). As noted above, a RAM vessel displays **red-white-red** vertical lights. Additionally, a dredging vessel will show two all-round red lights on the side of the obstruction and two all-round green lights on the side safe for passage (Rule 27(d)). The primary signal is not three red lights.