I think they simply start different divisions on different days, at least according to the sailing instructions [1] There are a variety of handicapping systems

I think they simply start different divisions on different days, at least according to the sailing instructions [1] There are a variety of handicapping systems. This race uses TPYC ratings determined by US Sailing [2] The TPYC rating uses the mainly downwind Transpac Wind Matrix, a Pacific Swell adjustment, a power trim adjustment, and a handicap course length of 2300 nautical miles to establish time allowances from the fastest rated yacht. Other rating systems include IMS[3], attempting to make predictions of potential boat performance based on detailed hull measurements, and IRC[4], a committee based system trying to avoid attempts to game the handicaps. [1] http://www.yachtscoring.com/event_documents/728/SI2013.pdf http://www.yachtscoring.com/event_documents/728/SI2013.pdf [2] http://www.transpacrace.com/docs/2013racedocs/NOR2013.pdf http://www.transpacrace.com/docs/2013racedocs/NOR2013.pdf [3] http://en.wikipedia.org/wiki/International_Measurement_System http://en.wikipedia.org/wiki/International_Measurement_Syste... [4] http://en.wikipedia.org/wiki/IRC_(sailing) http://en.wikipedia.org/wiki/IRC_(sailing)