The precise story, as told by Antonio Pigafetta and the other witnesses, is the fleet had anchored at a tiny—about 3,930 hectares according to Ginés de Mafra--island-port named Mazaua which The Genoese Pilot said was at latitude 9° north, locating the skerry in Mindanao.
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5650, Peillard in footnote 118 on page 314 and footnote 154 on page 317 assert Mazaua is in the latitude calculated by The Genoese Pilot at 9° north and that Mazaua was in fact part of Mindanao ("Elle en fait partie, en realite". It Mazaua forms part of it Mindanao).
Here it came out that the port of March–April 1521 was not Butuan but Mazaua.
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Largely with the appearance of the eyewitness account of Ginés de Mafra, the only seaman in Magellan's fleet to return to Mazaua, whose testimony reveals a concrete, measurable description of Mazaua, the skein starting from the garbled version of Pigafetta by Ramusio to the mishandling by Combés to Bellin and finally to Amoretti has been unraveled: Pigafetta's Gatighan is Bellin's Limasava.
The description of present-day Limasawa does not fit the geologic, geographic, geomorphologic, archaeologic, histriographic categories of Mazaua as described and explained in the eyewitness chronicles of Antonio Pigafetta, Ginés de Mafra, Francisco Albo, The Genoese Pilot, Martín de Ayamonte, as well as the secondhand accounts of Antonio de Brito, Andrés de San Martín, Antonio de Herrera y Tordesillas, and Maximilianus Transylvanus.
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The notion that Limasawa is Mazaua was first suggested by ex-Augustinian priest, Carlo Amoretti, who had not read what Combés had written about Limasawa.
He is first fully accounted for in the research finding of Vicente Calibo de Jesus in a paper read before the Society for the History of Discoveries held on October 13, 2000 at the U.S. Library of Congress, Washington DC, U.S.A. Heretofore, no writing ever related Ayamonte to Mazaua.