You are on a Mariner class cargo vessel....

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Question 1 of 2066636eec28f7522a1c51c6d2

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.)

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Question 1 of 20

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🔍 Key Concepts

• Metacentric height (GM) and how adding weight low in the ship affects it • How free surface effect in tanks can reduce the effective GM • Using the white pages of the Stability Data Reference Book to find which tanks are low in the ship and their effect on GM

💭 Think About

• Look at each tank listed in the choices in the white pages: are they high or low in the ship, and how would filling them change GM? • Consider whether the tanks would be pressed full or partially filled and what that means for free surface and GM. • Compare how much each combination of tanks changes GM in the white pages— which option brings GM from 3.0' closest to 4.1' without going the wrong direction?

✅ Before You Answer

• Verify in the white pages which tanks are double bottoms (DB) or other low tanks and whether ballasting them increases GM. • Check if any of the listed tanks, when partially filled, create a large free surface correction that could reduce GM instead of increasing it. • Confirm from the stability tables exactly how many feet of GM change each proposed tank or tank combination will produce, starting from GM = 3.0'.

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