A semisubmersible, 200 feet in length between draft marks with the LCF 10 feet aft of amidships, records the following drafts: Port Forward 64'-09"; Port Aft 68'-09"; Starboard Forward 59'-09"; and Starboard Aft 63'-09". What is the trim?

Correct Answer: Option D — 4 feet by the stern

Calculating mean drafts requires averaging port and starboard readings. Forward average is (64.75 + 59.75) / 2 = 62.25 feet. Aft average is (68.75 + 63.75) / 2 = 66.25 feet. Trim equals aft draft minus forward draft (66.25 - 62.25), resulting in 4 feet by the stern.