"Currently with the Defenders able to conduct in-house racing - Defence Trials or otherwise, on the America's Cup Course, they are able to cross-reference their performance data against that already available on the Challengers. Their additional advantage is that they can sail just before or after the Challengers, so get a better bearing on the actual conditions on the day - even though the winds may change in strength or direction.
Another implication of the claim is that the Defenders are able to conduct a closed race session on the America's Cup course, while the Challengers are obliged to conduct an open session in terms of the performance data."
