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An analysis of these claims was published
> by Gregory McIntosh, a historian of cartography,
> who examined the map in depth in his book The Piri
> Reis Map of 1513 (Athens and London: University of
> Georgia Press, 2000). He was able to find sources
> for much of the map in Columbus's writings.
> Certain peculiarities (such as the appearance of
> the Virgin Islands in two locations) he attributed
> to the use of multiple maps as sources; others
> (such as the errors in North American geography)
> he traced to the continued confusion of the area
> with East Asia. As far as the accuracy of
> depiction of the supposed Antarctic coast is
> concerned, there are two conspicuous errors.
> First, it is shown hundreds of kilometres north of
> its proper location; second, the Drake Passage is
> completely missing, with the Antarctic Peninsula
> presumably conflated with the Western Patagonian
> coast. The identification of this area of the map
> with the frigid Antarctic coast is also difficult
> to reconcile with the notes on the map which
> describe the region as having a warm climate.[36]
> [
en.wikipedia.org]