The Clubs in the International Group are the principal providers of the Blue Cards which provide the basis for States to issue the State certificates in accordance with the International Convention on Civil Liability for Oil Pollution Damage, 1992 (CLC).
The Convention requires the owner of a ship registered in a CLC Contracting State and carrying more than 2,000 tons of oil in bulk as cargo to maintain insurance cover in accordance with the requirements of the Convention, which is evidenced by the Blue Card issued by the Club. CLC tankers must carry a State certificate on board attesting the insurance coverage.