You are on a Mariner class cargo vessel. Your drafts are: FWD 22'-06", AFT 25'-06". You wish to increase the calculated GM of 4.8' to 5.9'. What tanks should you ballast? (Use the white pages in the Stability Data Reference Book.)

Correct Answer: Option A — Tanks: DB2, DB5

Reference to the Mariner class stability tables demonstrates that ballasting tanks DB2 and DB5 alters the ship's vertical center of gravity sufficiently to increase the available GM from 4.8 feet to the desired 5.9 feet under current draft parameters.