Question 6 GLI08 - Limited OUPV

The Correct Answer is D. **Why option D ("A power-driven vessel") is correct:** The definition and application of the Rules concerning a vessel propelled by both sail and machinery are governed by the International Regulations for Preventing Collisions at Sea (COLREGs), specifically Rule 25 (Sailing Vessels Underway and Vessels Under Oars). Rule 25(e) states: "A vessel proceeding under sail when also being propelled by machinery shall be regarded as a **power-driven vessel** for the purposes of these Rules." This is a fundamental concept in collision avoidance. When the engine is in use, the vessel gains the maneuverability and speed characteristics of a power-driven vessel, and therefore loses the privileges and status granted to a vessel "under sail only." Consequently, it must exhibit the lights and shapes, and follow the responsibilities (such as giving way to a pure sailing vessel), of a power-driven vessel. **Why the other options are incorrect:** * **A) A "special circumstance" vessel:** This term is not a formal navigational category defining a vessel's mode of operation under the Rules. Rule 2 applies to "departure from these Rules made necessary by the special circumstances," but it does not categorize the vessel itself as a "special circumstance" vessel. The vessel's operational status is clearly defined by Rule 25(e). * **B) A sail vessel:** The vessel ceases to be treated as a pure "sail vessel" (a vessel "under sail only") the moment the machinery is engaged for propulsion, regardless of whether the sails are still set. Being treated as a sail vessel would inaccurately imply it has the right-of-way over other power-driven vessels, which is not true in this combined mode. * **C) The vessel is not covered under any category:** This is incorrect. COLREGs are comprehensive and specifically address this exact scenario under Rule 25(e), placing the vessel firmly into the category of a power-driven vessel.