🔍 Key Concepts

• Use the Stability Data Reference Book – SS AMERICAN MARINER white pages to get the lightship data, hydrostatic KM for the final displacement, and free‑surface data. • Available GM is found from GM = KM - KG(corrected), where KG(corrected) includes the free‑surface correction (FSC). • To get KG, you need total vertical moments ÷ total displacement, using all weights in the load table plus lightship.

💭 Think About

• From the load table, how will you find the added weight and its total vertical moment (WT × KG) for each item, and then combine these with the lightship values from the book? • Once you know the final displacement, where in the white pages do you read off KM for that displacement, and how do you interpolate if the exact displacement is not listed? • How do you turn the given total free surface moments into a free‑surface correction and apply it to your initial GM or KG to get the available GM?

✅ Before You Answer

• Make sure your displacement includes lightship plus every weight in the table (crew & stores, liquids, all cargo, deck cargo). • Verify that you compute KG = (Σ WT×KG) / (Σ WT) before applying any free‑surface correction. • Confirm you convert the total free surface moments (15585) into a correction by dividing by displacement, and that you subtract this correction from GM (or add to KG) only once.