You are on a Mariner class cargo vessel. Your drafts are: FWD 26'-06", AFT 28'-02". You wish to increase the calculated GM of 2.7' to 2.9'. What tanks should you ballast? (Use the white pages in the Stability Data Reference Book.)

Correct Answer: Option D — Tanks: DB1, DT1

Utilizing the Stability Data Reference Book for the specified drafts of 26'-06" forward and 28'-02" aft shows that ballasting tanks DB1 and DT1 adds the specific low-level weight increments required to raise the calculated GM from 2.7 to 2.9 feet.