Victorien Erussard, an experienced ocean racer from the city of Saint-Malo in the north of France, was halfway through a dash across the Atlantic when he lost all power. Sails kept the boat moving, but Erussard relied on an engine and generator to keep the electronics running. He temporarily lost his autopilot and his navigation systems, jeopardizing his chances of winning the 2013 Transat Jaques Vabre race. Never again, he thought.

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