🔍 Key Concepts

• Navigation Rules Rule 27 – Vessels Not Under Command or Restricted in Their Ability to Maneuver • Meaning of three all-round lights in a vertical line: red–white–red • Day shapes corresponding to special vessel status (e.g., RAM, NUC, constrained by draft)

💭 Think About

• Look carefully at the vertical sequence and colors of the all-round lights shown. Which vessel status is indicated by that exact red–white–red pattern? • Once you identify the vessel as, for example, not under command, restricted in ability to maneuver, or constrained by draft, which day shape does Rule 27 say that type of vessel must show? • Compare each answer choice with the standard day shapes: which choice matches the day shape for the status indicated by red–white–red?

✅ Before You Answer

• Confirm from Rule 27 that red–white–red all-round lights in a vertical line correspond to a specific special operation or condition of a power-driven vessel or any vessel. • Match that condition to its required day shape (balls, diamonds, cones, or cylinder). • Eliminate shapes you know belong to other conditions: for example, two cones apexes together (not this vessel), single diamond, or cylinder.