30
Anchored Vessels and Vessels Aground
Anchored vessels show an all-round white light forward and another aft (lower). Vessels aground additionally show two red all-round lights.
Rule 30 prescribes lights for anchored vessels and vessels aground.
a
A vessel at anchor shall exhibit: in the fore part, an all-round white light; at or near the stern and at a lower level, another all-round white light. Vessels under 50m may show a single all-round white light.
b
A vessel of 100m+ at anchor shall also illuminate her decks.
d
A vessel aground shall exhibit the anchor lights plus two all-round red lights in a vertical line. Day shape: three balls in a vertical line.
Key Takeaways
1
Anchored: white light forward, lower white light aft
2
Vessels under 50m may use a single all-round white light
3
Aground: anchor lights PLUS two red all-round lights
4
Aground day shape: three balls vertically
Common Mistakes
Not realizing vessels aground show anchor lights PLUS red lights
Forgetting to illuminate decks on vessels 100m+ at anchor
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