Question 26 MODU01 - Offshore Installation Manager

The Correct Answer is D **Why option D is correct:** Option D is correct because it is a specific exception allowed under the Inland Navigational Rules (33 CFR Part 83) for Great Lakes vessels. Rule 23(c)(i) states that vessels 50 meters or more in length operating on the Great Lakes, in addition to the lights prescribed in Rule 23(a), may carry an all-round white light in lieu of the second masthead light and the stern light. This provision is designed to accommodate the lighting configurations commonly used by large commercial vessels (like bulk carriers and Lakers) on the Great Lakes. **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 (or "stern lights while towing") are specifically required under Rule 24 (Towing and Pushing) for any vessel engaged in towing, including those on the Great Lakes. No general exemption exists for 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 Rule 22 (Visibility of Lights) for vessels 50 meters or more in length, sidelights are required to have a minimum range of visibility of **three** miles (33 CFR 83.22(a)(ii)). * **C) The showing of a forward masthead light is optional for vessels under 150 meters.** This is incorrect. A forward masthead light is mandatory for all power-driven vessels underway, regardless of length, under Rule 23(a)(i). The length affects whether a second masthead light is mandatory (over 50 meters), but the forward light is always required.