Worth Avenue Yacht’s new central listing. HARBOUR ISLAND, 2011 55m (180’) NewCastle. HARBOUR ISLAND is a truly magnificent yacht whose build quality would rival that of any Northern European pedigree shipyard. She was built by an experienced yachtsman who made sure the build had every opportunity to be successful with the finest supervision, engineering, design, time and quality available today. Time of build was of no concern, quality took priority. The owner spared no cost in getting the vessel perfect before offering her to the market.