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This passage from the Near Oceania article seems interesting and relevant enough to incorporate into this article:
The settlement of Manus — in the Admiralty Islands — may represent a real threshold in voyaging ability as it is the only island settled in the Pleistocene beyond the range of one-way intervisibilty. Voyaging to Manus involved a blind crossing of some 60-90 km in a 200-300 km voyage, when no land would have been visible whether coming from the north coast of Sahul or New Hanover at the northern end of New Ireland. These would have been tense hours or days on board that first voyage and the name of Pleistocene Columbus who led this crew will never been known. The target arcs for Manus are 15° from New Hanover, 17° from Mussau and 28° from New Guinea. (Matthew Spriggs, The Island Melanesians, Oxford: Blackwell, 1997) --bmtm (talk) 18:29, 9 December 2013 (UTC)[reply]