Your vessel measures 122 feet long by 18 feet in beam. If the natural rolling period at a draft of 6'-09" is 5 seconds, what is the GM?

Correct Answer: Option D — 2.5 feet

Transverse stability is estimated via the roll period formula GM = (f * B / T)^2. Given an 18-foot beam and a 5-second roll period, applying standard constants results in a metacentric height of 2.5 feet.