The America's Cup Challenge takes place September 7–21, 2013 in San Francisco, California. Leading up to the match are a series of races, known as the Louis Vuitton Cup, which take place in July and August. The contenders are Artemis Racing, Emirates Team New Zealand, and Luna Rossa Challenge 2013. The winner of the Louis Vuitton Cup will be the challenger to the previous America's Cup winner, Oracle Team USA. The America's Cup Yachts are 72' catamarans with rigid wing sails. They are FAST. They need equally fast boats for the Umpires of the races.