Navigation Rules Rule 24 - Towing and Pushing (a) A power-driven vessel when towing astern shall exhibit: (i) Instead of the light prescribed in Rule 23(a)(i) or 23(a)(ii), (§§ 83.23(a)(i) and (ii)), 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 meters, three such lights in a vertical line;
{}