Question 26 GLI06 - Master or Mate of LT 100 GRT

The Correct Answer is D **Why option D is correct:** Option D is correct because it is a specific, established exception within the Inland Rules (specifically applying to the Great Lakes and qualifying vessels). Rule 23(d)(i) of the Inland Rules states that a power-driven vessel of less than 50 meters in length operating *Inland Only* (including the Great Lakes) may carry an all-round white light in lieu of the second masthead light and the stern light. This configuration is commonly known as the "2-mile light" setup for smaller vessels. **Why the other options are incorrect:** * **A) Great Lakes vessels are exempted from the requirement to show yellow towing lights.** * This is incorrect. While the specific display requirements for towing lights vary (depending on whether the vessel is pushing ahead or towing astern), vessels engaged in towing must still show the appropriate yellow towing light(s) as defined in 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(b) and (d) of the Inland Rules, sidelights for power-driven vessels 50 meters or more in length must have a minimum range of visibility of **three miles**. The two-mile visibility requirement generally applies only to vessels between 12 and 50 meters. * **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 (with specific exceptions for small vessels addressed in Rule 23(d), which do not make the forward light optional, but rather allow substitution). Rule 23(a) requires vessels to show at least one masthead light. Length does not make the forward masthead light optional; it determines the requirement for a second (after) masthead light (mandatory for vessels 50 meters or more).