🔍 Key Concepts

• Use the GM = KM − KG(corrected) relationship from the Stability Data Reference Book white pages • Apply the free-surface correction using the given total free-surface moment (FSM) and the vessel’s displacement • Compute the ship’s loaded KG by summing all vertical moments (W × KG) for lightship plus all items in table ST-0192, then dividing by total displacement

💭 Think About

• From the white pages, which hydrostatic value must you read at the sailing displacement in order to start a GM calculation? • How do you turn the list of weights and KGs in table ST-0192 (plus lightship data from the book) into a single overall KG for the loaded condition? • Once you have KM and KG, how does the given total free-surface moment change the final GM value?

✅ Before You Answer

• Be sure you are using the correct displacement and KM that correspond to the ship’s actual mean draft in this loading condition • Confirm that you included lightship weight and KG along with every weight in the ST-0192 table when calculating total moments • Verify that you applied the free-surface correction as FSM ÷ displacement, and that you subtracted this correction from the initial GM to get the available GM