The International Americas Cup Class is a class of racing yacht that was developed for the America's Cup between 1992 and 2007. These yachts, while not identical, were all designed to the same formula to offer designers the freedom to experiment whilst keeping the boats sufficiently comparable to race in real time. The class was established for the 1992 America's Cup because of perceived shortcomings of the 12-metre class, which had been used in the America's Cup since 1958. In addition to the America's Cup, IACC yachts were raced in other regattas, including the IACC worlds. IACC Sail numbers IACC sail numbers were issued according to the date when the ACM measurement committee decided that the hull has reached a certain stage of completion. The number came in two parts: the flag state (represented by a three letter prefix) and the hull number. The country code changed as the hull was transferred from flag state to flag state. Only one boat had a sail number issued twice as in the case of RUS-62 which was a new boat based on the heavily modified hull of RUS-24 and re-registered as RUS-62. IACC Rule Version 5.0 of the International America's Cup Class Rule was issued on December 15, 2003. Copyright is held jointly by the Defender Alinghi and the 'Challenger of Record' BMW Oracle Racing. Typical parameters of an IACC yacht were: length: weight: height of the mast: weight of the bulb: sail surface area: upwind, downwind crew: 17+ "18th man" Winning IACC yachts and teams America's Cup 2007 America's Cup Winner - Alinghi SUI-100 (defender), Switzerland 2003 America's Cup Winner - Alinghi SUI-64 (challenger), Switzerland 2000 America's Cup Winner - Team New Zealand NZL-60 (defender), Team New Zealand, New Zealand 1995 America's Cup Winner - Team New Zealand NZL-32 (challenger), New Zealand 1992 America's Cup Winner - America³ USA-23 (defender), United States Louis Vuitton Cup 2007 Louis Vuitton Cup Winner - Emirates Team New Zealand NZL-92, New Zealand 2003 Louis Vuitton Cup Winner - Alinghi SUI-64, Switzerland 2000 Louis Vuitton Cup Winner - Prada Challenge ITA-45, Italy 1995 Louis Vuitton Cup Winner- Team New Zealand NZL-32, New Zealand 1992 Louis Vuitton Cup Winner - Il Moro di Venezia ITA-16, Italy Umpire Signaling System (“USS”) The 2007 America’s Cup saw the introduction of the ‘’Umpire Signaling System’’ (USS) which allowed the Umpires to notify the two boats regarding their position in relation