The SS AMERICAN MARINER is partially loaded...

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Question 1 of 2066636eec28f7522a1c51cbdf

The SS AMERICAN MARINER is partially loaded with a GM of 2.6 feet and drafts of: FWD 13'-07", AFT 15'-01". Use the white pages of the Stability Data Reference Book to determine what tanks you should ballast to increase the GM to 3.4 feet.

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Question 1 of 20

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🔍 Key Concepts

• Metacentric height (GM) and how adding ballast low in the ship affects stability • How to use the white pages of the Stability Data Reference Book to find GM changes for individual tanks • Difference between double bottom (DB) tanks and deep tanks (DT) in terms of vertical center of gravity

💭 Think About

• First, determine whether you need to raise or lower the ship’s center of gravity to increase GM from 2.6 ft to 3.4 ft, and what that means for where ballast should be placed vertically. • Compare the vertical locations and GM effects of each listed tank combination in the white pages rather than just guessing by tank names. • Think about which combination of tanks will provide enough change in GM to reach 3.4 ft without over-correcting, based on the tabulated data.

✅ Before You Answer

• Verify in the white pages which tanks are low in the ship (near the keel) versus higher up. • Check the change in GM (ΔGM) listed for each candidate tank (or for the equivalent change in displacement and KG) and see which set moves GM from 2.6 ft to about 3.4 ft. • Confirm that the selected tanks do not create an undesirable trim condition beyond the vessel’s acceptable limits, using the trim/LCG information if provided.

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