A vessel is in distress and requires assistance.

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.

Two vessels: left - restricted in her ability to manoeuvre; right - sailing vessel; shall keep out of the way.

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

A vessel is in distress and requires assistance.

Two vessels: left - sailing vessel; shall keep out of the way; right - vessel not under command.

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

Tug & tow; astern; towing one vessel.

Tug hampered by tow; less than 50 metres; astern < 200 m in length; port side.

Any type of fishing vessel.

1) Sailing vessel or vessel under oars, underway. 3) Vessel or object being towed starboard side view. 

Trawler; 50 metres or more; hauling her nets; ahead. 

Tug hampered by tow; 50 metres or more; astern < 200 m in length; ahead.

Fishing vessel other than a trawler; starboard side.

Sailing vessel; underway; starboard side.

Vessel engaged in mine clearance; less than 50 metres; ahead; dangerous to approach within 1000 metres.

Sailing vessel or vessel under oars underway bow view. Vessel being towed bow view.

Fishing vessel other than a trawler when there is outlying gear extending more than 150 metres horizontally from the vessel.

Tug & tow; 50 metres or more; astern < 200 m in length; starboard side.

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