Towing an inconspicuous, partly submerged object

An inconspicuous, partly submerged vessel or object, or combination of such vessels or objects being towed, shall exhibit:

• if it is less than 25 metres in breadth, one all-round white light at or near the forward end and one at or near the after end
• if it is 25 metres or more in breadth, two additional all-round white lights at or near the extremities of its breadth;
• if it exceeds 100 metres in length, additional all-round white lights between these lights so that the distance between the lights shall not exceed 100 metres;
• a diamond shape at or near the aftermost extremity of the last vessel or object being towed and if the length of the tow exceeds 200 metres an additional diamond shape where it can best be seen and located as far forward as is practicable.

Tow shorter than 200 m, object shorter than 100 m
Abeam, port side
Tow longer than 200 m, object shorter than 100 m
Abeam, port side
Tow longer than 200 m, object longer than 100 m
Abeam, port side
Tow longer than 200 m, object longer than 100 m & wider than 25 m
Abeam, port side (note that often a fifth round white light in the center is added)
Ahead	Astern
Tow longer than 200 m, any object size
Day sign, Abeam, port side