draft survey

A draft survey is a method used to measure the weight of a ship by calculating the difference between its submerged and floating positions in water. When a ship is loaded, its weight causes it to sit lower in the water (draft) than when it is empty. By measuring the draft at the bow and stern before and after loading, surveyors can estimate the total weight of cargo on board. This process is essential for ensuring the ship is safely loaded and complies with legal weight limits. It is commonly used in shipping and maritime operations.