A slack tank and a limited calculation

A cargo vessel is preparing a loading condition for review. A classroom planning worksheet gives displacement as 2,000 tonnes and a free surface moment of 160 tonne-metres for one slack rectangular tank. Its uncorrected initial GM is 0.60 metres. Another officer has calculated the correction and wants to label the entire loading condition approved because the remaining GM is positive. The actual voyage also involves deck cargo, local deck loading limits, changing consumables and a forecast period of stronger wind. The team has access to the approved stability information and the cargo securing manual, but the complete checks have not yet been recorded. The worksheet is an illustration and is not the vessel’s validated loading computer.