Towing & Ship-Assist · Lights — Towing Astern Over 200 m
When the length of the tow (from the stern of the towing vessel to the after end of the tow) exceeds 200 meters, the towing vessel shows, in a vertical line, masthead lights numbering:
- AThree✓ Correct
- BTwo
- COne
- DFour
Explanation
Rule 24(a) requires two masthead lights in a vertical line for a tow of 200 m or less, but THREE masthead lights in a vertical line when the tow exceeds 200 m, warning other vessels of the exceptional length of the towing operation.
Authority: Navigation Rules, Rule 24(a)
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