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Have you seen a truck weighing bridge ? Do you know how it works ?
It weighs the empty weight of the truck and then the loaded weight. The difference is the weight of the cargo on that truck.
Well draft survey uses a similar principle to measure the cargo loaded on board ships.
With draft survey we measures the initial weight (displacement) of the ship and it measures the final weight (displacement) of the ship after loading. The difference plus all the weights that were taken out (like ballast) will be the cargo loaded.
The only difference between weight measurement in case of truck and ship is that for later the calculation is not that simple.
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About Capt Rajeev Jassal
Capt. Rajeev Jassal has sailed for over 24 years mainly on crude oil, product and chemical tankers. He holds MBA in shipping & Logistics degree from London. He has done extensive research on quantitatively measuring Safety culture onboard and safety climate ashore which he believes is the most important element for safer shipping.
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