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The onboard instruments are constantly calibrated throughout the day and are accurate to the hundreths. PUMA Ocean Racing powered by BERG during leg 4 of the Volvo Ocean Race 2011-12, from Sanya, China to Auckland, New Zealand. (Credit: Amory Ross/PUMA Ocean Racing/Volvo Ocean Race)

© Amory Ross/Puma Ocean Racing/Volvo Ocean Race http://www.puma.com/sailing
The onboard instruments are constantly calibrated throughout the day and are accurate to the hundreths. PUMA Ocean Racing powered by BERG during leg 4 of the Volvo Ocean Race 2011-12, from Sanya, China to Auckland, New Zealand. (Credit: Amory Ross/PUMA Ocean Racing/Volvo Ocean Race) photo copyright Amory Ross/Puma Ocean Racing/Volvo Ocean Race http://www.puma.com/sailing taken at  and featuring the  class
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