The SS AMERICAN MARINER is ready to bunker with drafts of FWD 18'-06", AFT 20'-06". After all bunkers are on board, soundings indicate the tonnages shown in table ST-0099 below. Use the white pages of The Stability Data Reference Book to determine the free surface correction.

Correct Answer: Option B — 0.91 foot

Free surface correction accounts for the virtual rise in the center of gravity due to liquid movement. Referencing the stability data tables for the given bunker soundings and vessel displacement, the calculated correction for the free surface effect on the SS AMERICAN MARINER is 0.91 feet.