Which certificate confirms the ship's gross tonnage and is issued after measurement?

• A. Safety Equipment Certificate
• B. Cargo Securing Manual
• C. IOPP Certificate
• D. International Tonnage Certificate (ITC)

Answer: (D)

Understanding how a ship’s size is officially recorded helps explain why the International Tonnage Certificate is the one that confirms gross tonnage after measurement. Gross tonnage is a calculated figure representing the ship’s overall internal volume, determined through formal tonnage measurement conducted under the International Convention on Tonnage Measurement of Ships (1969). Once that measurement is completed, the International Tonnage Certificate is issued by the flag state or an authorized organization, and it serves as the official proof of the ship’s tonnage figures for regulatory and administrative purposes. The other certificates listed pertain to different aspects—safety equipment, cargo securing procedures, and pollution prevention—rather than the ship’s volume measurement itself.