Who enforces conventions ratified by the IMO?

• A. Port authorities
• B. International trade unions
• C. Signatory states / Ship's Flag States
• D. Shipowners' associations

Answer: (C)

International maritime conventions become legally binding only after a country ratifies them and implements the provisions in its own laws. The enforcement rests with those signatory states through their flag states—the countries under whose flag a ship sails. The flag state is responsible for ensuring ships registered under its flag meet the conventions, including through surveys, certificates, and ongoing oversight. When ships enter ports, port authorities can check compliance under port state control, but the legal responsibility traces back to the flag state and the nation that ratified the convention. Unions, shipowners’ associations, or similar bodies don’t enforce these conventions; they influence standards and industry practice, while enforcement is carried out by the states involved.