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

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

Vessel engaged in mine clearance; 50 metres or more; port side; dangerous to approach within 1000 metres of the mine clearance vessel.

An air-cushion vessel; astern.

Two vessels: left - power-driven vessel; shall keep out of the way; right - any type of fishing vessel.

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

Trawler; 50 metres or more; starboard side.

Sailing vessel; underway; astern.

A vessel is in distress and requires assistance.

Two vessels: left - sailing vessel; shall keep out of the way; right - vessel engaged in mine clearance.

A vessel is in distress and requires assistance.

Tug & tow; less than 50 metres; tow alongside; ahead. 

For identification from the air.

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

Restricted in her ability to manoeuvre; 50 metres or more; or tug hampered by tow; less than 50 metres; astern < 200 m in length; ahead.

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

Tug & tow; astern.

Sailing vessel; underway; ahead.

Fishing vessel other than a trawler; port side.

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