183. Your vessel displaces 696 tons and measures 135'L by 34'B. What is the reduction in GM due to free surface if the fish hold (32'L by 29'B by 9'D) is filled with 2.0 feet of water? (Each foot of water weighs 26.5 tons)

The reduction in GM due to free surface is calculated using the formula ΔGM = (W1 * B2) / (12 * Δ), where W1 is the weight of water per foot of depth (26.5 tons/ft), B is the tank breadth (29 ft), and Δ is the vessel's displacement (696 tons), resulting in a reduction of 2.48 feet.