Power-driven vessel; less than 50 metres; port side.

Constrained by draught; less than 50 metres; port side.

For identification from the air.

Sailing vessel; underway; starboard side.

Both sailing vessels have the wind on the same side; the vessel which is to windward shall keep out of the way of the vessel which is to leeward.

Not under command; making way; ahead.

The sailing vessel which has the wind on the port side shall keep out of the way of the other.

Vessel engaged in dredging or underwater operations; less than 50 metres; restricted in her ability to manoeuvre; stopped and making no way; green lights side may pass.

Restricted in her ability to manoeuvre; less than 50 metres; ahead.

Vessel engaged in dredging or underwater operations; 50 metres or more; restricted in her ability to manoeuvre; starboard side; underway; starboard side on which the obstruction exists.

Trawler; stopped and making no way through the water.

Vessel engaged on PILOTAGE duty; no specified length; port side.

Fishing vessel other than a trawler; starboard side.

Constrained by draught; more that 50 metres; starboard.

Tug hampered by tow; 50 metres or more; astern > 200 m in length; starboard side.

A vessel is in distress and requires assistance.

Constrained by draught; astern.

Tug hampered by tow; 50 metres or more; astern > 200 m in length; port side. 

Vessel engaged in dredging or underwater operations; 50 metres or more; restricted in her ability to manoeuvre; port side; port side on which may pass.

Trawler; making way; astern.