High Quality Content by WIKIPEDIA articles! Class 1, referred to officially as the UIM Class 1 World Powerboat Championship, is widely regarded as the pinnacle of international offshore powerboat racing, and is officially sanctioned by the Monaco based Union Internationale Motonautique (UIM), the world governing body of powerboating. Class 1 races run under a set of rules which are agreed by the Offshore Professional Committee (OPC), which are ratified and issued by the UIM, and by which all teams, participants and raceboats must comply.