Question 42 RVR03 - Mate of LT 500-1600 GRT

The Correct Answer is A **Explanation for Option A (Correct):** Option A, "two all-round red lights in a vertical line," is the correct answer because it directly reflects the requirements mandated by the International Regulations for Preventing Collisions at Sea (COLREGs), specifically Rule 27(a)(i). This rule states that a vessel "not under command" (NUC) must exhibit two all-round red lights in a vertical line where they can best be seen. This visual signal informs other mariners that the vessel is unable to maneuver as required by the Rules and must be avoided. **Explanation for Other Options (Incorrect):** * **B) a stern light:** While a vessel that is "underway" normally exhibits navigation lights (which include a stern light, masthead light(s), and sidelights), a vessel that is **not under command** (NUC) and **not making way** is **only** required by Rule 27(a) to show the two all-round red lights. The requirement to exhibit the additional sidelights and stern light (as defined in Rule 30 for an anchored vessel or Rule 27(a)(iii) for an NUC vessel making way) is waived when the NUC vessel is **not making way**. * **C) sidelights:** Similar to the stern light, sidelights (port and starboard) are part of the standard navigation lights for a vessel underway. However, the specific scenario described ("not under command, underway but **not making way**") exempts the vessel from showing the standard running lights (sidelights and stern light), requiring only the two all-round red lights (Rule 27(a)(i)). * **D) All of the above:** This is incorrect because the vessel's status as NUC and *not making way* exempts it from exhibiting the standard running lights (stern light and sidelights). If the vessel were NUC and **making way through the water**, then "All of the above" would be the correct answer (Rule 27(a)(iii)). However, since the vessel is "not making way," only the two red lights are required.