The 2013 OOISS Commodore's cup is a race in two parts: 22 February & 17 May (counts double).

The 2013 edition will be the 6th Commodore's Cup. The Cup was initiated in 2007 as a farewell race to the then RAHBC Commodore Volker Vahrenkamp. Volker offered the cup which can hold 2 Champagne Bottles. The Commodore's cup is race for catamarans up to 21 ft. The boats race on handicap as defined by the SCHRS (Small Catamaran Handicap Rating System) adjusted for local RAHBC conditions (age/condition of boats and ranking of the Helm). This is done to try and give everyone a fair chance to win the cup (rather than the best sailor!).

The 2007 cup was won by the new Commodore, Tony van Thiel, mainly because of his boat, a 20ft Hobie Miracle. The Miracle also won him the 2009 and 2010 events. In 2011 he was beaten by 1 point by the father/son combination of Rob and Michiel on their H-16.The 2012 edition (the first one without Tony van Thiel) was won by Giles and Jules Brinsley in their Hobie 16.