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What are the lights/shapes for a vessel being pushed ahead (not composite unit)?

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Final answer:

A vessel being pushed ahead that is not a composite unit must display two masthead lights in a vertical line, sidelights, a sternlight, and a special flashing light in accordance with the COLREGs Rule 24, and a diamond shape during the day if the tow length exceeds 200 meters as per Rule 25.

Step-by-step explanation:

The lights and shapes for a vessel being pushed ahead, but not forming a composite unit, are specified in the International Regulations for Preventing Collisions at Sea (COLREGs). According to Rule 24 of the COLREGs, a power-driven vessel when pushing ahead or towing alongside, except in the case of a composite unit, must exhibit:

  • two masthead lights in a vertical line,
  • sidelights,
  • a sternlight,
  • and a special flashing light.

In addition, Rule 25 requires that these vessels exhibit shapes during the day, including a diamond shape where it can best be seen to indicate that it is towing and the length of the tow exceeds 200 meters.

User Gene S
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