Rules of the Road · Anchored & Aground
A vessel at anchor shall show by night:
- AAn all-round white light where it can best be seen
- BAn all-round white light forward and an all-round white light aft, the after light being lower✓ Correct
- CSidelights and an all-round white light
- DA flashing white light
Explanation
Rule 30(a) requires an anchored vessel to show an all-round white light in the fore part of the vessel and a second all-round white light at or near the stern, lower than the forward light. This two-light combination helps observers judge the vessel's length and orientation.
Authority: 72 COLREGS Rule 30(a)
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