Question 29 OSV01 - Master/Chief Mate - Offshore Supply Vessels

The Correct Answer is A. **Explanation for Option A (2) being correct:** This question is based on the specific regulations outlined in the U.S. Inland Navigation Rules (33 CFR Subchapter E, Part 83), specifically addressing anchor lights for vessels over 50 meters in length. * **Rule 30(a)(i):** A vessel at anchor shall exhibit forward where it can best be seen one all-around white light. * **Rule 30(a)(ii):** A vessel at anchor shall exhibit an all-around white light or a ball (if less than 50 meters) near the stern and at a lower level than the forward light. For a barge that is **more than 50 meters long**, Rule 30 mandates the exhibition of **two** all-around white lights: one forward and one aft (lower than the forward light). The designation "Secretary approved 'special anchorage area'" is relevant under Rule 30(g) (Special Anchorage Areas), but that rule only exempts vessels **less than 20 meters** and barges **less than 20 meters** from showing anchor lights in such areas. Since this barge is greater than 50 meters, it is required to show the standard complement of two anchor lights regardless of being in a "special anchorage area." **Explanation of why other options are incorrect:** * **Option B (1):** One light is only sufficient for vessels **less than 50 meters** in length when anchored, or for smaller vessels anchored in restricted visibility (Rule 30(b)). A vessel over 50 meters must show two lights to clearly indicate its length and status. * **Option C (3):** Three white anchor lights are not a standard requirement for an anchored vessel of any length under normal conditions (Rule 30). * **Option D (None):** "None" would only be correct if the vessel were either less than 20 meters in length (and anchored in the special anchorage area under Rule 30(g)) or if it were underway. Since the barge is over 50 meters and is anchored, it must display the mandated lights.