Anchor Light

An all-round white light displayed as part of the prescribed signal for a vessel at anchor.

It enables other mariners to recognise the presence and status of an anchored vessel after dark and in restricted visibility. The required number, position and visibility range depend on vessel length and the applicable collision regulations, so the signal is not always a single light at the masthead.

An anchor light should show an unobstructed all-round sector, have adequate power and be checked after anchoring. Deck working lights may be used where appropriate but must not obscure or be mistaken for the prescribed signal.