🔍 Key Concepts

• Navigation Rules Rule 27 – Vessels Restricted in Their Ability to Maneuver • Meaning of all-round red and green lights placed in pairs on each side of a vessel • What extra lights a vessel at anchor and engaged in dredging or underwater operations must show, in addition to normal anchor lights

💭 Think About

• Look at the two all-round white lights in a vertical line first. What type of status do two all‑round whites usually indicate for a vessel that is not making way? • Now study the pairs of green and red all‑round lights toward each side. On a dredge, which color marks the side where you may safely pass, and which color marks the side with the obstruction? • Compare each answer choice with the idea of a vessel that is restricted in ability to maneuver and must show passing information to other vessels. Which option matches that situation best?

✅ Before You Answer

• Confirm which answer choice involves a vessel restricted in her ability to maneuver while not underway but at anchor • Verify which option would logically need to mark a safe side vs. obstructed side using green and red all‑round lights • Eliminate any options that would normally show standard towing or pilot lights rather than multiple all‑round red/green indicators