BOATFEED: January 31

PUMA Ocean Racing powered by BERG team navigator Tom Addis explains the strategy behind tacking and stacking. Each tack or gybe requires all gear stowed down below to be moved from side to side, or "stacked", by Mar Mostro's crew in order to maintain proper weight balance.

Follow PUMA as they tack, gybe and race round the world in the Volvo Ocean Race 2011-12