Hatteras GT63: Hatteras Yachts will debut their new GT63 at its Collins Avenue display. When powered with twin 1,900-horsepower Caterpillar C32a diesels (engine options include 1,600- and 1,800-horsepower C32as) the GT63 cruises at 36 knots, with a range of 440 nautical miles. Top speed is a builder-estimated 41 knots. www.hatterasyachts.com