The SS AMERICAN MARINER is partially loaded...

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Question 1 of 2066636eec28f7522a1c51cbe1

The SS AMERICAN MARINER is partially loaded with a GM of 3.1 feet and drafts of: FWD 16'-00", AFT 18'-04". Use the white pages of the Stability Data Reference Book to determine what tank(s) you should ballast to increase the GM to 3.6 feet.

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Question 1 of 20

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🔍 Key Concepts

• GM (metacentric height) and how adding ballast in different locations (double bottoms vs deep tanks) affects GM • Using the Stability Data Reference Book white pages to find tabulated GM changes for specific ballast tanks • Effect of trim and tank vertical position (high vs low, midships vs ends) on increasing or decreasing GM

💭 Think About

• Look up each listed tank (or tank pair) in the white pages and compare how much each option would change GM from 3.1 ft toward 3.6 ft at approximately this draft and displacement • Think about where each candidate tank is located vertically in the ship and whether adding weight there tends to increase or decrease GM • Consider whether you need a small, moderate, or large change in GM and which option’s tabulated GM effect most closely matches a +0.5 ft change

✅ Before You Answer

• Verify the displacement and draft condition in the white pages that most closely matches FWD 16'-00" and AFT 18'-04" • For each answer choice, verify the total change in GM (ΔGM) produced by filling that tank or set of tanks and compare it to +0.5 ft • Confirm whether the tank(s) in each option are low in the ship (double bottoms) or higher up (deep tanks) and whether that is consistent with increasing GM

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