A jack-up, 180 feet in length, has the center of flotation at 110 feet aft of frame zero. The draft at the bow is 11.0 feet and the draft at the stern is 13.0 feet. What is the true mean draft?

Correct Answer: Option C — 12.22 feet

True mean draft is the draft at the Center of Flotation (LCF). Using linear interpolation between forward and aft drafts across the vessel's length, the draft at the LCF location (110 feet aft of frame zero on a 180-foot vessel) calculates precisely to 12.22 feet.