Tonight in Barcelona the technicians and analysts of INEOS Britannia, Luna Rossa Prada Pirelli and Alinghi Red Bull Racing will be having a field day running through perhaps one of the most valuable days for data – the liquid gold of the Louis Vuitton 37th America’s Cup. A Garbi breeze of around 10-14 knots greeted the teams through the late morning and into the early afternoon but it was a false promise and steadily, ever so gradually, lessened and weakened as the afternoon wore on.