22.30 Anchored vessels and vessels aground

(1) A vessel at anchor must exhibit where it can best be seen—

(a) in the fore part, an all-round white light or one black ball; and

(b) another all-round white light at or near the stern at a lower level than the light in the fore part;

BUT if the vessel is less than 50 metres in length it may exhibit an all-round white light where it can best be seen instead of the lights referred to in subparagraphs (a) and (b) of this paragraph.

(2) A vessel of 100 metres or more in length must also use the available working or equivalent lights to illuminate its decks when at anchor. Any other vessel at anchor may do so also.

(3) A vessel of less than 7 metres in length at anchor, not in or near a narrow channel, fairway, anchorage, or where other vessels normally navigate, is not required to exhibit the shape prescribed for a vessel at anchor.

(4) A vessel aground must exhibit the white light or lights for a vessel at anchor prescribed in rule 22.30 (1), and in addition, where they can best be seen—

(a) two all-round red lights in a vertical line; and

(b) three black balls in a vertical line.

(5) A vessel of less than 12 metres in length, when aground, is not required to exhibit the lights or shapes prescribed in 22.30(4) for a vessel aground.