Question 25 GLI05 - Master or Mate of LT 200 GRT

The Correct Answer is B **Explanation for Option B (Correct):** The placement requirements for navigation lights, including the masthead light, are detailed in the **Inland Navigation Rules** (specifically Rule 21 and Rule 23, and their related annexes, particularly Annex I which deals with positioning and technical details of lights and shapes). For power-driven vessels **less than 12 meters in length**, the technical requirements are significantly relaxed due to size constraints. According to Annex I, Section 2(i) (Positioning and Technical Details of Lights and Shapes), a power-driven vessel less than 12 meters in length may have the masthead light located off the fore and aft centerline, provided that the necessary requirement for the sidelights to be combined in one lantern on the fore and aft centerline is met, or the sidelights are positioned correctly. The key allowance is granted based solely on the vessel being less than 12 meters, permitting the masthead light (or all-round white light serving as a masthead light) to be offset where necessary. **Explanation of Incorrect Options:** * **A) which has separate sidelights carried on the outboard extremes of the vessel's breadth:** While this positioning of sidelights is standard for larger vessels, it does not inherently authorize the masthead light to be offset from the centerline. The rules generally require the masthead light to be on the fore and aft centerline unless a specific exemption (like the size exemption in option B) is granted. * **C) engaged in fishing:** A vessel engaged in fishing must display specific lights (red over white all-round lights) in addition to, or instead of, standard navigation lights. However, the requirement for the basic masthead light (if carried) to be on the centerline is generally maintained regardless of the activity, unless the vessel falls under a size exemption. * **D) less than 20 meters in length:** While vessels less than 20 meters receive some relaxations (e.g., in light height requirements), the specific exemption allowing the masthead light to be located other than on the fore and aft centerline is restricted to the smallest category, which is **less than 12 meters** (Option B). Vessels between 12 and 20 meters generally must comply with the centerline requirement for the masthead light.