🔍 Key Concepts

• International & Inland Navigation Rules – Part C: Lights and Shapes • Meaning of vertical combinations of all-round red and white lights • Special signals for vessels restricted in their ability to maneuver versus towing or dangerous cargo

💭 Think About

• Look closely at the order of the lights from top to bottom. What does red–white–red indicate in the Rules? • Does an anchor light alone ever appear in a tall stack with other red lights like this, or is that used for a special type of vessel or operation? • Which of the listed vessel types is most likely to show multiple all‑round lights indicating a restriction, rather than just standard masthead, side, and stern lights?

✅ Before You Answer

• Identify which options would normally require red over white (fishing), white over white (towing), or red–white–red (special restriction). • Confirm from the Rules whether a vessel at anchor and engaged in dredging or cable work would show anchor lights alone or anchor lights plus red–white–red. • Make sure the lights in the picture are all‑round and in a single vertical line, not separate masthead and towing lights, before matching to an answer choice.