Question 26 ONC06 - Master LT 100 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, specifically applicable to Great Lakes vessels navigating the Western Rivers or the Great Lakes. This rule provides an exception for certain smaller power-driven vessels (specifically, a power-driven vessel of less than 50 meters in length when navigating on the Great Lakes) allowing them to combine their lighting requirements. The vessel may carry an **all-round white light** (visible 360 degrees) in lieu of both the required second (after) masthead light and the required stern light. This simplification is a recognized allowance under the Inland Navigation Rules, 33 CFR § 83.23(d). **Why Options A, B, and C are Incorrect:** * **A) Great Lakes vessels are exempted from the requirement to show yellow towing lights.** This is incorrect. Yellow towing lights (required to be shown above the stern light) are mandatory for towing vessels under the Inland Rules, including those operating on the Great Lakes, if they are engaged in towing. There is no general exemption based on location. * **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(a) (Visibility of Lights), the required minimum range for the sidelights of a power-driven vessel 50 meters or more in length is **three miles**, not two miles. The two-mile range applies to vessels 20 meters or more but less than 50 meters in length. * **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 when underway (Rule 23). The requirement is only optional for the *second* masthead light (the after masthead light) on vessels less than 50 meters in length (Rule 23(a)(ii)), but the forward masthead light is always required for a power-driven vessel underway, regardless of its length below 150 meters.