Question 26 ONC05 - Master or Mate of LT 200 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 special provisions for Great Lakes vessels (Inland Only). Specifically, Rule 23(d)(ii) states: "A power-driven vessel of 50 meters or more in length may carry, in addition to the lights prescribed in subparagraph (i), an all-round white light in lieu of the second masthead light and stern light prescribed in Rule 23(a)." This provision grants specific flexibility to large Great Lakes vessels regarding their masthead and stern lighting configuration, making option D true. **Why the other options are incorrect:** * **A) Great Lakes vessels are exempted from the requirement to show yellow towing lights.** This is incorrect. The requirement to show yellow towing lights (two masthead lights in a vertical line) applies to power-driven vessels when towing (Rule 24(a)). Great Lakes vessels are not exempted from this general towing requirement. * **B) Sidelights for vessels over 50 meters are required to have only a two-mile range of visibility.** This is incorrect. According to Rule 22 (Visibility of Lights), sidelights for vessels 50 meters or more in length must have a minimum range of visibility of **3 miles**. The 2-mile range applies only to sidelights on 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. Rule 23(a) requires all power-driven vessels underway to show a forward masthead light. The special provisions for Great Lakes vessels (Rule 23(d)) do not make the forward masthead light optional; rather, they specify that Great Lakes vessels of 50 meters or more in length must carry this light, and they may also carry a second masthead light **aft and higher than the forward one**, or utilize the alternate lighting arrangement described in option D. The forward masthead light remains mandatory.