Heesen’s Ann G had one of the most rigorous sea trials of any custom superyacht in recent memory. The 164-foot, steel-hulled yacht proceeded from Heesen’s yard in the Netherlands into the North Sea for her tests and then made her way north for a shakedown cruise in the fjords of Norway.

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Following the owner’s brief, the Clifford Denn–designed exterior has a powerful, aggressive profile with a long forefoot and white, curved aluminum superstructure that looks more like a sport ya…