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The draft survey is performed by reading the ship's draft on the draft markings at six standard points on the hull: forward, midships and aft on both port and starboard sides. Corrections for factors such as trim, water density and non-cargo weight changes are made before calculating the cargo weight change.

Raw Draft Calculation; Fore Mean or Fm = (FP+FS)/2, Mid Mean or Mm = (MP+MS)/2, and Fore Mean or Am = (AP+AS)/2. while Apparent Trim or AT = Am ? Fm. the Apparent Trim is the Trim that visually find. Draftmark posision and correction to perpendicular.

Final Draft Calculation ? Fore and Aft Mean (FAm) = (Fcd + Acd) / 2 = (10.796 + 11.196) / 2 = 21.992 /2 = 10.996 M. ? Mean of Mean Draft (MM) = (Mcd + FAm / 2) = (10.965 + 10.996) /2 = 21.961 / 2 = 10.9805 M. ? Quarter Mean (MMM) = (MM + Mcd) /2 = (10.9805 + 10.965) /2 = 21.9455 /2 = 10.97275 M. = 10.973 M.

At the time of reading the draught marks, the vessel should be upright with a minimum of trim. The trim at survey should never exceed the maximum trim for which corrections may be included in the vessel's stability book. The vessel should ideally be lying in still, calm water.

Draught surveys by their very nature are not an exact science, and the accuracy of the calculated cargo figure may vary typically by between 0.5 and 1.0%. However, there are occasions when considerable differences in the cargo figures derived from the draught surveys are obtained.

Boat Draft Formula To calculate a boat draft, divide the weight by the density, then divide this result by the result of the length divided by the width, then finally, multiply by 3. This draft also does not include motors of rutters.

How is the draft calculated? Explanation: Draft is calculated as, the difference between the starting thickness of the workpiece and the final thickness of the workpiece.