The Hatteras Yachts GT65 Carolina has some design changes from its GT siblings. The flybridge is pushed back a little, in a design nod to earlier Hatteras sport-fish yachts. There are newly designed side windows, and the engine-room side vents are longer. But the GT65 retains the series’ trademarks, such as generous bow flare, seakeeping ability and fish-raising muscle. ¶ The owner of our test boat, Rascal, is a seasoned yachtsman, angler and family man who considered all of these attributes in his purchase. He worked as a mate on fishing boats when he was younger and has always been around boats with his family. Having owned several Hatteras sport-fish yachts, he decided the GT65 Carolina was the next logical move. ¶ Rascal’s captain, Nick Millsap, has worked with the…