 This was the world’s first circumnavigation by multihull.Following his longstanding interest in old navigational methods used to explore and populate the Pacific, he employed similar techniques for the Tahiti-New Zealand leg of the "Rehu Moana" voyage without using a compass, sextant or marine chronometer.In 1967, Lewis acquired another boat, "Isbjorn", to embark on further field studies of traditional Polynesian navigation.