The International Thunderbird Class Association is the governing body of the Thunderbird Sailboat. The purpose of the organization is to promote and develop the Thunderbird class under uniform rules. The organization maintains “The Black Book” which specifies measurements and required equipment in order to preserve the one-design status of the boats. The ITCA also sanctions regional and international events, maintains a roster of paid membership and boats, and is responsible for rendering decisions on boat measurement issues. The ITCA holds an Annual General Meeting in January or February of each year which is open to all members in good standing.