USCG Exam Practice · Knots, Bends, and Hitches
When towing a vessel astern, the catenary of the tow line serves which primary function?
- AIt keeps the towed vessel's bow aligned with the towing vessel's stern
- BIt reduces the overall length of the tow, improving manoeuvrability
- CIt absorbs shock loads transmitted between the towing vessel and the tow✓ correct
- DIt prevents the tow line from fouling the towed vessel's propeller
Why C is correct
Per the Boatswain's Mate Manual, the catenary (sag) of the tow line absorbs shock loads. The manual further notes that longer tow lines increase shock absorption but reduce manoeuvrability, making option B directly contrary to the source.
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