You are on a Mariner class cargo vessel. Your drafts are: FWD 24'-00", AFT 25'-08". You wish to increase the calculated GM of 3.0' to 4.1'. What tanks should you ballast? (Use the white pages in the Stability Data Reference Book.)

Correct Answer: Option C — Tanks: DB4, DT6

Cross-referencing the vessel's stability manual at drafts 24'-00" forward and 25'-08" aft dictates that ballasting DB4 and DT6 introduces the correct combination of low-level weight to raise the calculated GM from 3.0 to 4.1 feet.