🔍 Key Concepts

• Navigation Rules, Part C – Lights and Shapes (Rules 20–31) • Mnemonic light combinations: "white over red", "red over white", "green over white", "red over green" • Difference between fishing vs trawling vs pilot vs sailing light configurations

💭 Think About

• First, decide whether the three lights you see are meant to be all-round lights in a vertical line or normal sidelights/masthead lights. How would that change your interpretation? • Match the color sequence you see (top to bottom) to the standard combinations used for fishing, trawling, pilot, and sailing vessels at night. • Ask yourself: which of the four vessel types listed is identified primarily by a vertical stack of special all‑round lights, rather than just by its normal running lights?

✅ Before You Answer

• Verify the exact vertical order and colors of the lights in the illustration before choosing. • Check Rule 25 (sailing vessels), Rule 26 (fishing and trawling vessels), and Rule 29 (pilot vessels) for their special light combinations. • Be sure you are distinguishing between masthead/sidelights used for ordinary power/sailing vessels and special all‑round lights that uniquely indicate the vessel’s type or activity.