Your vessel measures 131 feet long by 20 feet in beam. If the natural rolling period at a draft of 8'-03" is 6 seconds, what is the GM?

Correct Answer: Option A — 2.15 feet

Metacentric height is derived from the rolling period equation GM = (f * B / T)^2. With a 20-foot beam and a 6-second roll period, standard coefficient calculations give 2.15 feet of transverse stability.