Question 26 GLI04 - Mate of LT 500-1600 GRT

The Correct Answer is D **Why option D is correct:** Option D is a direct application of Rule 23(d) of the Inland Rules, which includes the special rules for the Great Lakes. Specifically, it refers to the lighting requirements for power-driven vessels under 20 meters in length when navigating the Great Lakes (or other waters covered by Inland Rules). Rule 23(d) states that a power-driven vessel of less than 12 meters in length may carry an all-round white light and sidelights, and a power-driven vessel of less than 20 meters may carry, in lieu of the second masthead light and sternlight, an all-round white light, and may also carry, in lieu of the masthead light and sternlight, an all-round white light. This provision allows smaller vessels to simplify their lighting arrangement by using a single all-round white light in place of both the second masthead light (if required) and the sternlight. **Why the other options are incorrect:** * **A) Great Lakes vessels are exempted from the requirement to show yellow towing lights.** This is incorrect. Yellow towing lights (specifically, the yellow stern light displayed above the white sternlight) are required for all vessels engaged in towing, including those on the Great Lakes, as per Inland Rule 24. There is no general exemption for Great Lakes vessels from this requirement. * **B) Sidelights for vessels over 50 meters are required to have only a two-mile range of visibility.** This is incorrect. According to Annex I, Section 9(a) of the Inland Rules (Visibility of Lights), sidelights for vessels 50 meters or more in length must have a minimum range of visibility of **3 miles**, not 2 miles. A 2-mile range is generally required only for vessels between 12 meters and 50 meters. * **C) The showing of a forward masthead light is optional for vessels under 150 meters.** This is incorrect. The forward masthead light is mandatory for all power-driven vessels operating under the Inland Rules, regardless of length (except for very small vessels under 12m, as detailed in Rule 23(d)). The only difference related to length is that vessels under 50 meters are not required to show the second (after) masthead light, but the **forward** masthead light is required.