What is the trim of a jack-up with forward draft of 11 feet and aft draft of 13.75 feet?
β’ Trim is the difference between forward and aft drafts β’ Be careful with which draft you subtract from which so the sign (by the bow or by the stern) is correct β’ Convert any mixed numbers or decimals carefully when comparing to choices
β’ How do you calculate trim when given a forward draft and an aft draft? Which one should you subtract from which? β’ If the aft draft is larger than the forward draft, is the vessel trimmed by the bow or by the stern? β’ Once you find the numerical difference in feet, which answer choice most closely matches that value?
β’ Confirm which draft is forward and which is aft before doing any math β’ Re-check your subtraction carefully to avoid simple arithmetic errors β’ Make sure your final wording (by the bow / by the stern) matches the physical situation described by the drafts
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