Question 26 GLI02 - Mate of Unlimited Tonnage

The Correct Answer is D **Why Option D is Correct:** Option D states: "An all-round white light may be carried in lieu of the second masthead light and stern light." This statement is correct based on the *Inland Navigational Rules (33 CFR Part 83)*, specifically Rule 23(d)(i), which provides a special allowance for power-driven vessels when operating *only* on the Great Lakes. This rule states: > "(d) *Great Lakes vessels.* A power-driven vessel when operating **only on the Great Lakes** and designated waters is not required to carry the second masthead light prescribed in paragraph (a) of this Rule. However, such a vessel may carry, in lieu of the second masthead light and stern light prescribed in Rule 23(a)(ii) and 23(a)(iii), an **all-round white light** aft higher than the forward masthead light." This exception simplifies the lighting configuration for large Great Lakes vessels by substituting the required second (after) masthead light and the separate stern light with a single, higher all-round white light placed aft. **Why the Other Options are Incorrect:** * **A) Great Lakes vessels are exempted from the requirement to show yellow towing lights.** * **Incorrect.** The requirement for yellow towing lights (specifically, the special identification light above the stern light, as per Inland Rule 24) applies to vessels when towing and is not exempted for Great Lakes vessels. Inland Rule 24(a)(v) specifies the requirement for the second towing light (the yellow light) to be carried above the stern light. * **B) Sidelights for vessels over 50 meters are required to have only a two-mile range of visibility.** * **Incorrect.** Visibility requirements for sidelights are based on vessel length (Rule 22). For vessels $50$ meters or more in length, sidelights must have a minimum range of visibility of **3 miles**, not 2 miles. * **C) The showing of a forward masthead light is optional for vessels under 150 meters.** * **Incorrect.** Inland Rule 23(a)(i) requires all power-driven vessels (regardless of length) to show a forward masthead light. There is no provision making this light optional for vessels under 150 meters. (Note: Only the *second* masthead light is optional for Great Lakes vessels, as described in Rule 23(d)(i), which relates to the correct answer D.)