Your vessel measures 127 feet long by 17 feet in beam. If the natural rolling period at a draft of 7'-10" is 5 seconds, what is the GM?

Correct Answer: Option A — 2.24 feet

Using the relationship between beam and rolling period, GM = (f * B / T)^2. For a 17-foot beam and 5-second roll period, applying standard factor f = 0.38 yields a metacentric height of 2.24 feet.