PUBLIC LAW 96-591—DEC. 24, 1980
94 STAT. 3425
(d) A power-driven vessel when operating on the Great Lakes may carry an all-round white light in lieu of the second masthead light and sternlight prescribed in paragraph (a) of this Rule. The light shall be carried in the position of the second masthead light and be visible at the same minimum range. RULE 24
Towing and Pushing (a) A power-driven vessel when towing astern shall exhibit: 33 USC 2024. (i) instead of the light prescribed either in Rule 23 (a)(i) or 23(a)(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; (ii) sidelights; (iii) a sternlight; (iv) a towing light in a vertical line above the sternlight; and (v) when the length of the tow exceeds 200 meters, a diamond shape where it can best be seen. (b) When a pushing vessel and a vessel being pushed ahead are rigidly connected in a composite unit they shall be regarded as a power-driven vessel and exhibit the lights prescribed in Rule 23. (c) A power-driven vessel when pushing ahead or towing alongside, except as required by paragraphs (b) and (i) of this Rule, shall exhibit: (i) instead of the light prescribed either in Rule 23(a)(i) or 23(a)(ii), two masthead lights in a vertical line; (ii) sidelights; and (iii) two towing lights in a vertical line. (d) A power-driven vessel to which paragraphs (a) or (c) of this Rule apply shall also comply with Rule 23(a)(i) and 23(a)(ii). (e) A vessel or object other than those referred to in paragraph (g) of this Rule being towed shall exhibit: (i) sidelights; (ii) a sternlight; and (iii) when the length of the tow exceeds 200 meters, a diamond shape where it can best be seen. if) Provided that any number of vessels being towed alongside or pushed in a group shall be lighted as one vessel: (i) a vessel being pushed ahead, not being part of a composite unit, shall exhibit at the forward end sidelights, and a special flashing light; and (ii) a vessel being towed alongside shall exhibit a sternlight and at the forward end sidelights, (g) An inconspicuous, partly submerged vessel or object being towed shall exhibit: (i) if it is less than 25 meters in breadth, one all-round white light at or near each end; (ii) if it is 25 meters or more in breadth, four all-round white lights to mark its length and breadth; (iii) if it exceeds 100 meters in length, additional all-round white lights between the lights prescribed in subparagraphs (i) and (ii) so that the distance between the lights shall not exceed 100 meters: Provided, That any vessels or objects being towed alongside each other shall be lighted as one vessel or object; (iv) a diamond shape at or near the aftermost extremity of the last vessel or object being towed; and
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