Oh darn, need to let American Bureau of Shipping and the USCG know that! Maybe the IMO needs to rewrite the Load Line Convention.
You must be thinking about the metric tonne which is just 1.6 percent less than the long ton and for purposes of stability and loading is equivalent in the eyes of class and flag. Because the difference is so small, the maritime world doesn't much care.
Point being, and to correctly answer the question, in nautical discussions, displacement is not normally given in short tons.
Displacement tonnage is a calculated volume of water entered into an equation in order to derive a tonnage number for stability purposes. It may or may not be the actual weight because that will vary with salinity and temperature so is very much a moving target in any event.
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