The Piri Reis map is incorporated in a catalog called the Book of Navigation and most of the maps in this Book of Navigation depict the Marmara Sea, the Bosporus, Cyprus and Crete Islands, the Aegean, and the Mediterranean Sea.
Those are very accurate for the time. The famous Piri Reis map depicts a pretty accurate shore of South America up to a point, then the shore unifies with Antarctica. Many speculated that this map shows Antarctica without ice. This map was created in 1513 when the treatise of Tordesillas was in place already, but the Magellan Strait was not yet discovered. The Piri Reis map looks a little bit out of place compared with the other maps in the Book of Navigation. There is a possibility that the cartographer was aware of the Magellan Strait already and tried to mislead and misinform other navigators on the existence of the Magellan Strait, and Cape Horn, which were doors to the trade with Asia navigating towards the West. From 1453 until the time of this map, the Ottoman Empire controlled trade with the West.
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