🔍 Key Concepts
• Masthead lights requirements for power-driven vessels in Rule 23 (Power-driven Vessels Underway)
• Special lighting rules for towing vessels, vessels restricted in their ability to maneuver (RAM), fishing vessels, and sailing vessels
• Length thresholds (e.g., 50 meters and above) that affect whether a vessel must show one or two masthead lights when making way
💭 Think About
• First, decide which of the listed vessels are treated as power-driven vessels underway for their basic navigation lights, and which have completely different primary light configurations
• Think about how the lighting for RAM, towing, fishing, and sailing vessels is added to—or replaces—the standard power-driven vessel masthead lights
• For vessels required to show two masthead lights in a line, what is the minimum length, and which of the options meet that length requirement while still being in the correct vessel category?
✅ Before You Answer
• Check Rule 23 to see which vessels must exhibit forward and after masthead lights in a vertical line when making way
• Verify which special categories (RAM, towing, fishing, sailing) still use the power-driven vessel masthead light pattern as their base lighting, with additional special lights
• Confirm that the vessel type you select is required to show two masthead lights because of length, not just special-category lights such as red-white-red, green-over-white, or red-over-white