Arriving by boat to Oceania from the coasts of Peru in thesouth-eastern Pacific is a colossal achievement. Legend states
that a Peruvian Inca of Tawntinsuyo did it around the year 1489. In 1947, Thor Heyerdahl replicated the crossing in his Kon Tiki raft. The Inca Tupac Yupanqui appears to havebeen a conqueror seeking expansion for his empire beyond the seas;according tooral records, he departed leading a
fleet of 400 boats in a maritime journey that would have taken himto Polinesia. Del Busto explores both posibilities of theitinerary of the Incan fleet which, according to tradition, came across the westernislands of Auachumbi and Ninachumbi. Thefirst optionexplored is that of the thesis that he could have navigated the Pacific Ocean, within the scope of America, to the Galapagos Islands. In this case, it is probable that Isabela, the largest archipelago of the Galapagos, was Ninachumbi, visited first. When in the Galapagos--rocky-, dry- and volcanic-lookingislands--he came across nothing valuable nor curious that could serve as atrophy to show on his return, he would havecentred his hopes on Auachumbi, the other
island that, in this case, would have been Terarequi, themajorof thePearl Islands in the Bay of Panama. Del Busto later examines the second possibility: the crossing to Oceania, whose course would have been very long. Following the Southern Ecuatorial Current, Tupac Yupanqui would have navigated to the west, towards Polinesia.Del Busto arrives at the conclusion thatEaster Island could have been Ninachumbi, as well as that Tupac Yupanqui would have arrived first at Mangareva--Auachumbi--andwould have visited Easter Island afterwards. In theepilogue, after considering bothhypotheses--that of America and that of Oceania--Del Busto declares that he inclines towards the latter, showing it to be most plausible,real and evident.He puts forward twentyreasons for this, among them thepolinesian legends about the king Tupa and his fleet ofsail boatson the island of Tangareva, which tells thatthey were from a country situated where the sun is born; and the legend ofUho, which tells of an island maid and of the prince Mahauna Te Ra'a, whose name is translated as"Son of the Sun". In the firstchapter there is an interesting study of the prehispanic boats, their characteristics andmarine possibilities. Thebook appeared in theyear 2000 and it has 159 pages. It includesfootnotes.s