The SS AMERICAN MARINER is ready to bunker with drafts of FWD 14'-04", AFT 17'-06". After all bunkers are on board, soundings indicate the tonnages shown in table ST-0180 below. Use the white pages of The Stability Data Reference Book to determine the free surface correction.
Official USCG Answer & Rule Citation
Correct Answer: Option D — 1.48 feet
Stability assessments must include the free surface effect for all slack tanks. By applying the data from table ST-0180 to the vessel's displacement at the specified draft, the total free surface moment results in a virtual rise of the center of gravity equal to 1.48 feet.
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