Question 46

The Correct Answer is A **Explanation for Option A (Correct Answer):** Option A ("The vessel's lights must comply as closely as possible.") is correct because it directly reflects the exception provided in the Inland Navigation Rules (specifically Rule 38 - Exemptions). Rule 38 (d) addresses the specific scenario where a vessel is unable to comply with the spacing and placement requirements for lights due to the Secretary's determination regarding its construction or intended use. This rule states that in such cases, the vessel's lights must comply as closely as possible with the Rules. This acknowledges that certain pre-existing or specially constructed vessels cannot physically meet the specific geometric requirements. **Explanation of Incorrect Options:** **B) The vessel must be altered to permit full compliance with the rules.** This is incorrect. If the Secretary has already determined that the vessel cannot comply, forcing an alteration would be impractical, excessively costly, or structurally unsound, defeating the purpose of the exemption provided in Rule 38. **C) An all-round light should be substituted for the after-masthead light and the stern light.** This is incorrect. While substitution of lights is addressed elsewhere in the rules (e.g., for vessels less than 12 meters), it is not the required action specifically for a non-compliant spacing requirement determined by the Secretary. The requirement in this specific scenario is maximum compliance ("as closely as possible") with the defined lights, not a substitution of light types. **D) The vessel must carry only the lights that comply with the rules; the others may be omitted.** This is incorrect. Omitting required lights severely compromises safety and visibility, and is contrary to the spirit of the rules. The requirement is to attempt to display *all* required lights, positioning them as close to the specified rules as the vessel's structure allows.