Independent calculation of loaded weight through draft readings and displacement principles.
Draft Survey determines the weight of cargo loaded or discharged from the vessel's displacement, applying Archimedes' principle to draft readings. It's the independent method of reference when no scale or direct measurement is available at the port.
Draft readings fore, aft and midships, on both sides of the vessel.
Water density taken at the berth.
Displacement calculation before and after the operation.
Determination of the cargo weight loaded or discharged.
A Draft Survey report with the draft readings, water density and the displacement calculation record — the technical support behind the reported weight.