Residensea&rsquo;s The World will expand its itinerary offerings in 2009, making a maiden call in Papua New Guinea during the winter, and sailing the Bering Sea for the first time in the summer. <br /><br />The World, the only private residential community at sea, will also expand on its shore excursions, said Nikki Upshaw, senior vice president of sales and marketing at Residensea. &ldquo;The goal is to have more expeditions in exotic destinations, contributing to an immersive travel experience,&rdquo; Upshaw said. Many excursions will be walking tours involving as many as 10 experts, she added.<br /><br />In recent years, several companies have also been trying to build ships with residential properties onboard, but none have gotten off the drawing board.<br /><br />&ldquo;With no shipyard slots awarded yet, the soonest someone would enter this market would be 2011,&rdquo; Upshaw said, &ldquo;as it would take at least two years to build. But competition is good; it keeps you on your toes.&rdquo;