Question 17 ONC06 - Master LT 100 GRT

The Correct Answer is B **Explanation for Option B (Sidelights and a stern light):** The International Regulations for Preventing Collisions at Sea (COLREGs), Rule 24(c), governs the lighting requirements for a vessel (or object) being pushed ahead or towed alongside. Since the vessel being towed alongside is effectively part of the composite unit being propelled by the towing vessel, it must show the lights required for a power-driven vessel of its length, but it is specifically exempt from showing masthead lights. COLREGs Rule 24(c)(i) states that a vessel being towed alongside shall exhibit: 1. **Sidelights** 2. **A stern light** These lights identify the vessel's extremities and its direction of travel to approaching vessels. **Explanation for Incorrect Options:** * **A) One all-round white light:** This light configuration (Rule 30) is reserved for vessels aground or certain vessels less than 7 meters in length at anchor when it is impracticable to show the standard anchor lights. It is not the correct signal for a vessel being towed alongside. * **C) A masthead light, sidelights, and a stern light:** A single vessel being towed alongside (Rule 24(c)(i)) is explicitly required **not** to show a masthead light. The masthead light is shown by the power-driven vessel doing the towing (Rule 24(a)) to indicate propulsion. * **D) Only the outboard sidelight and a stern light:** While the vessel being towed alongside may show the lights of a vessel pushed ahead if it is rigidly connected (Rule 24(c)(ii)), the default requirement for a vessel being towed alongside (Rule 24(c)(i)) is to show **both** sidelights and a stern light. Limiting it to only the outboard sidelight is insufficient and could lead to confusion regarding the vessel's orientation.