Family owned and operated since our inception, the J.M. Martinac Shipbuilding Corporation, now in its third generation of family management, specializes in the design and construction of vessels up to 250 feet long. Over the years we have delivered more than 300 vessels, including tuna seiners, harbor tugs for commercial and military customers, oceangoing tugs, factory trawlers, ferries, yachts, U.S. Coast Guard patrol boats and a research sailing vessel.