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Indicates the left side of a vessel; used during night-time to signal a ship's port (left) side to another vessel.

A white light placed at the stern; used to show the rear aspect of a vessel to other vessels.

Indicates the right side of a vessel; used during night-time to signal a ship's starboard (right) side to another vessel.

A white light placed over the fore and aft centerline of the vessel; used to show the presence of a ship from the front and sides.

Signifies a power-driven vessel that is over 50 meters in length.

Indicates that a vessel is engaged in mine clearance operations.

Signifies a towing vessel; indicates a vessel towing astern.

Used on profiled minesweeper vessels to indicate safe passage for other vessels.

Used by air-cushion vessels such as hovercrafts when operating in non-displacement mode.

A distress signal used by vessels requiring assistance.

This light pattern is used to mark dredging or underwater operations.

Indicates a vessel not under command; it cannot maneuver as required by the rules and should be avoided.

Used by law enforcement and other official vessels to signal their status.

Indicates a pilot vessel on duty. When at anchor, the vessel will display only the white and red lights.

Used to indicate a vessel is not under command or restricted in its ability to maneuver.

Signals a sailing vessel underway.

Signals a vessel with restricted maneuverability.

Indicates a trawling vessel; signals that nets are being pulled.

Indicates a hovercraft or other vessels that are non-displacement mode crafts.