Towing
A power-driven vessel when towing shall exhibit:
- two masthead lights in a vertical line. When the length of the tow, measuring from the stern of the towing vessel to the after end of the tow exceeds 200 metres, three such lights in a vertical line;
- sidelights;
- a sternlight;
- a towing light in a vertical line above the sternlight;
- when the length of the tow exceeds 200 metres, a diamond shape where it can best be seen.
| Tugboat longer than 50 m – tow longer than 200 m | ||
 | ||
| Abeam, port side | ||
 |  |  |
| Ahead, Day sign (diamond shapes) | Ahead | Astern |
| Tugboat shorter than 50 m – tow longer than 200 m | ||
 | ||
| Abeam, port side | ||
 |  |  |
| Ahead, Day sign (diamond shapes) | Ahead | Astern |
| Tugboat longer than 50 m – tow shorter than 200 m | ||
 | Abeam, port side | |
 |  |  |
| Ahead, Day sign (no shapes) | Ahead | Astern |
| Tugboat shorter than 50 m – tow shorter than 200 m | ||
 | Abeam, port side | |
 |  |  |
| Ahead, Day sign (no shapes) | Ahead | Astern |
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