🔍 Key Concepts

• Power-driven vessel underway lighting requirements (International & Inland) • Length breakpoint for additional masthead lights (under vs. over 50 meters) • Difference between a tug towing and a tug not engaged in towing at night

💭 Think About

• First, ignore that it is a tug and ask: what lights does any power-driven vessel of about 30 meters show when underway at night? • Think about when extra masthead lights are required – does a 30-meter vessel need one, two, or three masthead lights when NOT towing? • Consider whether a vessel underway and not towing is ever allowed to show ONLY a stern light at night.

✅ Before You Answer

• Verify what Rule 23 – Power-driven vessels underway requires for vessels under 50 meters in length • Confirm that towing lights and extra masthead lights for towing apply ONLY when the vessel is actually engaged in towing, not just because it is a tug • Make sure the configuration you choose still includes sidelights and a stern light, and check how many masthead lights are required for a 30 m power-driven vessel