Question 17 ONC03 - Master LT 500-1600 GRT

The Correct Answer is B **Explanation for Option B (Sidelights and a stern light):** This requirement is mandated by the International Regulations for Preventing Collisions at Sea (COLREGs), specifically Rule 24(f). Rule 24(f) governs the lights shown by a vessel being towed. It states that such a vessel must exhibit the lights prescribed in Rule 23 (lights for a power-driven vessel underway) **except** that it shall not exhibit the masthead light(s). The standard lights for a power-driven vessel underway (Rule 23) are: 1. Masthead light(s) 2. Sidelights 3. Stern light By excluding the masthead light(s), the single vessel being towed alongside must show only the **sidelights and a stern light**. *** **Explanation of why other options are incorrect:** * **A) One all-round white light:** This light configuration is typically reserved for small vessels (less than 7 meters) or vessels at anchor/aground, not for a vessel being towed underway alongside a tug. * **C) A masthead light, sidelights, and a stern light:** This option includes the masthead light. Rule 24(f) explicitly mandates that vessels being towed *shall not* exhibit the masthead light(s). * **D) Only the outboard sidelight and a stern light:** A vessel being towed must exhibit both sidelights as part of the required Rule 23 configuration (less the masthead light). There is no provision in the general rules for a towed vessel to show only the outboard sidelight.