Ten years ago, I ventured to the Abacos, where I met up with Hull No. 1 of Hatteras Yachts’ new convertible line: the GT series. The sport-fisherman was 60 feet length overall, and on test day, winds were blowing at 40 mph. Powered with 1,800 hp Caterpillar diesels, the GT60 made a 36-knot cruise in some serious chop. She rode rock-solid on an infused, solid-fiberglass hull, a variable-deadrise design and a wave-splitting entry.