🔍 Key Concepts

• Rule 21 – Definitions of lights in the Navigation Rules • The difference between masthead light, stern light, and towing light • How a towing light is displayed relative to the stern of a towing vessel

💭 Think About

• First, recall what color a towing light must be under the Rules, then compare that to each option. • Think about which other light a towing light is intentionally made similar to, so other vessels can quickly recognize a vessel engaged in towing at night. • Ask yourself: does a towing light shine all‑round, or over a limited arc like another specific navigation light?

✅ Before You Answer

• Verify the color requirement for a towing light in Rule 21. • Check whether the towing light’s arc of visibility is the same as a masthead light or a stern light. • Confirm whether a towing light is required to be all‑round or limited to a specific sector.