A vessel is 50 meters long and shows two anchor lights. Which statement is true?

• A. It must display two anchor lights by rule
• B. It does not need anchor lights
• C. It must display one anchor light
• D. It only displays anchor lights during daytime

Answer: (A)

When a vessel is at anchor, it must signal its presence to other ships with anchor lights. For vessels that are 50 meters or longer, the rule requires two anchor lights displayed in a vertical line near the bow. Since this vessel is exactly 50 meters, two anchor lights are required by rule, so seeing two lights is correct. The other statements don’t fit because anchor lights are needed to indicate anchorage, not only one light at this length, and they are used to improve visibility at night or in reduced visibility, not just during daytime.