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The following data fields provide technical information about how much the vessel weighed (in tons) OLD STYLE Definition Weight of the vessel as measured before 1865 Options Input the digits Measuring a istyle tonnage into the Status Optional Publicly Displayed Yes Repeatable No Additional Notes Only applicable if the vessel was built before 1865 Field allows up to 20 ct GROSS TONNAGE Definition Weight of the volume of all space in the ship Options Status Recommended Publicly Displayed Yes Repeatable No Additional Notes Field allows up to 20 characters NET TONNAGE Definition Weight of the volume of all cargo carrying space of ship Options Status Recommended Publicly Displayed Yes Repeatable No Additional Notes Field allows up to 20 characters