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Tonnage Certificate Cancellation: Cancelled if there are structural alterations that change the net or gross tonnage (e.g., enclosing a deck space), when a ship changes its flag, or when the vessel is transferred to a new registry.
OPRC (Oil Pollution Preparedness, Response and Co-operation): An international convention establishing framework measures for national emergency response infrastructures to handle oil pollution incidents.
India's OPRC Focal Point: The headquarters is managed under the Indian Coast Guard (ICG), with its central maritime pollution command operating out of New Delhi, supported by regional pollution response centers in Mumbai, Chennai, and Port Blair. The ICG acts as the Central Coordinating Authority for marine oil spill response in India's Exclusive Economic Zone (EEZ).