Your vessel displaces 968 tons and measures 158'L x 40'B. You ship a large wave on the after deck. What is the reduction to GM due to free surface before the water drains overboard, if the after deck measures 65'L x 40'B and the weight of the water is 80 tons?

Correct Answer: Option B — 9.45 feet

Free surface reduction from shipped deck water is proportional to the cubic breadth of the fluid plane and inversely proportional to total ship displacement. For the given 968-ton vessel parameters, the calculated stability loss is 9.45 feet.