The SS AMERICAN MARINER has the following drafts: FWD 09'-00", AFT 15'- 11.5". Upon completion of loading and bunkering the items shown in table ST-0026 below will be on board. Use the white pages of The Stability Data Reference Book to determine the minimum GM required to meet a one compartment standard.
• Using the mean draft (average of forward and aft drafts) to enter stability tables • Locating the One-Compartment Standard – Minimum Required GM table in the white pages of the Stability Data Reference Book • If the exact draft is not listed, using linear interpolation between the two surrounding drafts
• From the given forward and aft drafts, what is the ship’s mean draft, and which draft line in the Stability Data Reference Book does that put you near? • In the white pages, which specific table gives the required GM for a one-compartment standard, and does it depend on displacement or only on draft for the AMERICAN MARINER booklet? • If your exact mean draft is between two table values, how would you carefully interpolate to avoid picking a value that is too low for the required GM?
• Confirm you computed the mean draft correctly from 09'-00" forward and 15'-11.5" aft before going into any table • Verify you are on the One-Compartment Standard (not two-compartment or grain) page and in salt water, as used for the exam booklet • Double-check any interpolation math and make sure the required GM you select is not less than the interpolated value (round conservatively toward safety)
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