Your vessel displaces 869 tons and measures 136'L x33'B. You ship a large wave on the after deck which measures 52'Lx 33'B. The weight of the water is estimated at 52.8 tons. What is the reduction in GM due to free surface before the water drains overboard?
Official USCG Answer & Rule Citation
Correct Answer: Option A — 4.83 feet
Uncontained water on an after deck reduces effective GM based on the moment of inertia of the free surface area. Applying FSC = (l * b^3) / (12 * V) for 52.8 tons of water on a 52' by 33' deck gives 4.83 feet.
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