Convention Measurement System
Convention Measurement System means the measurement system under subpart B of this part, which is based on the rules of the Convention. This Formal Measurement System uses the vessel's total enclosed volume as the principal input for tonnage calculations along with other characteristics related to the vessel's carrying capacity, including the volume of cargo spaces and number of passengers. Tonnages assigned under this system are expressed in terms of gross tonnage ITC (GT ITC) or net tonnage ITC (NT ITC).