🔍 Key Concepts

• Rule 30 – Anchored Vessels and Vessels Aground in the Navigation Rules • Difference between a vessel at anchor, aground, not under command, and restricted in ability to maneuver • Meaning of two all-round red lights in a vertical line at night

💭 Think About

• First decide: is a vessel aground considered a special case of a vessel at anchor, or a completely different status? Check what Rule 30 says. • Look up what lights a vessel simply at anchor must display at night, then ask: what extra lights are added when she is aground? • Compare the light patterns for not under command (NUC) and restricted in ability to maneuver (RAM) with the pattern described in the question. Do they match or are they different situations?

✅ Before You Answer

• Verify in Rule 30 what lights are required for a vessel at anchor at night. • Verify the additional lights required in Rule 30 when that anchored vessel is aground (note the phrase "in addition to"). • Confirm that NUC and RAM light patterns both involve red and white combinations, not just the two red lights mentioned here.