Your vessel has a displacement of 10,000 tons. It is 350 feet long and has a beam of 55 feet. You have timed its rolling period to be 15.0 seconds. What is your vessel's approximate GM?

Correct Answer: Option C — 2.60 feet

Applying the standard USCG rolling period formula GM = (0.38 * B / T)^2 for a 55-foot beam and 15-second roll period determines the approximate metacentric height to be 2.60 feet.