Question 25 GLI03 - Master-LT 500-1600 GRT

The Correct Answer is B **Explanation for Option B (Correct):** Option B is correct based on the specific rules governing lighting requirements for smaller vessels, particularly those under 12 meters in length (Rule 23(d), Inland and International). For a power-driven vessel less than 12 meters in length, if it is impracticable to carry the masthead light at the fore and aft centerline, the rule permits it to be offset from the centerline. This flexibility is provided to accommodate the practical limitations and design constraints often found on very small boats. The vessel must still meet all other visibility requirements for the light (height, range, arc of visibility). **Explanation of Incorrect Options:** **A) which has separate sidelights carried on the outboard extremes of the vessel's breadth:** While vessels of certain sizes may carry sidelights at their outboard extremes, this placement relates to the sidelights (Rule 23(c)(i)), not the structural requirement for the masthead light to be located on the vessel's fore and aft centerline. **C) engaged in fishing:** A vessel engaged in fishing (whether or not underway) must display specific fishing lights (Rule 26) in addition to its normal running lights (including the masthead light, if applicable). The operational activity of fishing does not grant an exemption from placing the masthead light on the fore and aft centerline; the standard rules for that vessel's length category still apply regarding light placement. **D) less than 20 meters in length:** Rule 23(a) generally requires the masthead light to be located "in the fore and aft centerline" for power-driven vessels. The specific exception for offsetting the masthead light is limited to vessels **less than 12 meters** in length (Rule 23(d)). A vessel between 12 and 20 meters must still adhere to the centerline requirement.