What is the trim of a jack-up with a forward draft of 12 feet and an after draft of 13 feet?

Correct Answer: Option A — 1.0 foot by the stern

Vessel trim is calculated as the algebraic difference between draft aft and draft forward. With an aft draft of 13 feet and a forward draft of 12 feet, the vessel is trimmed 1.0 foot by the stern (13' - 12' = 1').