Your vessel displaces 728 tons and measures 138'L by 31'B. What is the reduction in GM due to free surface if the fish hold (36'L by 29'B by 9'D) is filled with 3.6 feet of water? (Each foot of water weighs 29.8 tons)
Official USCG Answer & Rule Citation
Correct Answer: Option B — 2.50 feet
Free surface correction (GG') calculates the upward virtual shift of the center of gravity due to sloshing liquids. Utilizing the provided fish hold dimensions and vessel displacement results in a precise metacentric height reduction of 2.50 feet.
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