Anchoring Lights (Colreg) Colreg rules. Lights during anchoring. Vessel of less than 50 m in length at anchor from sunset to sunrise and from sunrise to sunset in restricted visibility Anchored vessel, longer than 50 mDay sign (1 black sphere)Abeam, port sideAheadAsternAnchored vessel, shorter than 50 mDay sign (1 black sphere)Abeam, port sideAheadAsternAnchored sailing boatDay sign (1 black sphere)Abeam, port sideAheadAstern

Sailing and Motoring A vessel proceeding under sail which has her engine running shall exhibit forward where it can best be seen a conical shape, apex downwards.She shall exibit lights according to a power-driven vessel. Sailing and motoringDay signAbeam, port sideAheadAstern

Not under command A vessel not under command shall exhibit: Two all-round red lights in a vertical line where they can best be seen; Two spherical shapes in a vertical line where they can best be seen; and When making way through the water also normal sidelights and a sternlight (not shown in the example below). Vessel not under command, not making way through the waterDay sign (two black spheres)Abeam, port sideAheadAsternSailing boat, no wind, no mechanical propulsionAbeam, port sideAheadAstern

Restricted in her ability to Maneuver A vessel restricted in her ability to manoeuvre, except a vessel engaged in mine clearance operations, shall exhibit: three all-round lights in a vertical line where they can best be seen. The highest and lowest of these lights shall be red and the middle light shall be white; three shapes in a vertical line where they can best be seen. The highest and lowest of these shapes shall be balls and the middle one a diamond; when making way through the water, also a masthead light or lights, sidelights and a sternlight Restricted in her ability to manoeuvre, not making way through the waterDay sign: two black spheres…

Minesweeper A vessel engaged in mine clearance operations shall in addition to the lights prescribed for a power-driven vessel, or to the lights or shape prescribed for a vessel at anchor, exhibit three all-round green lights or three balls. One of these lights or shapes shall be exhibited near the mast head and one at each end of the fore yard. These lights or shapes indicate that it is dangerous for another vessel to approach within 1000 metres of the mine clearance vessel. Minesweeper, shorter than 50 mAhead, day signs (3 black spheres)AheadAstern