🔍 Key Concepts

• Rule 30 – Anchored Vessels and Vessels Aground in the Navigation Rules • The special requirements for vessels 100 meters or more in length at anchor • The difference between masthead lights (steaming lights) and anchor lights

💭 Think About

• First, recall what kind of light pattern an anchored vessel shows, and how that changes when the vessel’s length is 100 meters or more. • Look at the angles given (112.5° vs 225°). Which light sectors are normally associated with sidelights, masthead lights, or stern lights? • Ask yourself: for a large vessel at anchor, where are the required white lights placed (fore, aft, or both), and what is their general characteristic (all-round or directional)?

✅ Before You Answer

• Verify under Rule 30 what additional light is required for vessels 100 meters or more in length at anchor. • Check which of the listed angles (112.5° or 225°) actually match any required anchor light configuration (remember anchor lights are normally all-round 360°). • Confirm whether lighting up the decks with working lights is optional or required for the rule being tested.