Question 6 RVR03 - Mate of LT 500-1600 GRT

The Correct Answer is C. **Explanation for C being correct:** Option **C** represents the length of a vessel as defined by the Convention on the International Regulations for Preventing Collisions at Sea (COLREGs), which govern both International and Inland waters (where applicable). The Rules defining the application of lights and sound signals are often based on the vessel’s **Length Overall (LOA)**. Length Overall is the maximum length of the vessel's hull measured between the foremost part and the aftermost part, including all integral parts of the hull (like stern projections or bowsprits if they are permanent parts of the hull structure). In illustration D086RR, line C typically spans the extreme ends of the physical hull, defining the LOA. **Explanation of why other options are incorrect:** * **A) A is incorrect** because it appears to represent the length measured at the waterline (LWL) or a specific portion of the hull below the deck. While important for naval architecture, LWL is generally not the length used for determining required lighting or sound signal appliances under COLREGs (which use LOA). * **B) B is incorrect** because it represents the length between perpendiculars (LBP), which is a naval architectural measurement used for design calculations (measured between the forward side of the stem and the after side of the stern post/rudder stock). LBP is shorter than LOA and is not the measure used for regulatory purposes under the Rules. * **D) D is incorrect** because it measures the length of the vessel's superstructure or deckhouse, or possibly the length of the main deck. This measurement excludes the full dimensions of the hull (such as the bow and stern overhangs) and therefore does not represent the vessel's overall length as defined by the Rules.