🔍 Key Concepts

• Towing vessel lights under the Navigation Rules (Rule 24) • The normal masthead light arc of visibility for power-driven vessels • How towing lights compare to a vessel’s standard masthead and sidelights

💭 Think About

• Think about what type of light is carried on the masthead of a towing vessel. Is it a full-circle (all-round) light, a sidelight, or a standard masthead (steaming) light? • Compare the visibility arc of a masthead (steaming) light to that of sidelights and stern lights. Which one most closely matches what a towing vessel shows forward? • Ask yourself: does the towing arrangement change the arc of each light, or just the number and arrangement of masthead lights?

✅ Before You Answer

• Confirm from the Navigation Rules what the standard masthead light arc is for a power-driven vessel underway • Verify the different arcs for sidelights, stern light, and all-round light so you can eliminate incorrect angles • Make sure you understand that towing lights on the masthead still follow the masthead light arc requirement, not the sidelight or stern light arcs