Deck General USCG Question #4047 (Set 129)

In the context of shiphandling, what would be the definition of shallow water?

Official USCG Answer & Rule Citation

Correct Answer: Option C — Water depth of less than twice a vessel's draft

Shallow water effects become significant when the depth is less than twice the vessel's draft. In these depths, the pressure distribution around the hull changes, increasing squat, reducing maneuverability, and altering the vessel's response to rudder commands due to the restricted flow of water beneath the keel.

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