Some years ago when I was in Turkey I visited the Naval Museum. It had some displays about Reis and his work, including some of his maps. I asked if I could see the famous Piri Reis map of the "new world." I was told it wasn't there in the Museum, but was in the former Imperial Palace. Some time later I toured the Palace, and asked if I could see the map. I was told it wasn't there, it was in the Naval Museum.
I hope the Turkish bureaucracy hasn't lost the thing.
You probably need official academic papers to see the thing now. Ever since Hapgood every amateur Atlantis hunter in the world has wanted to take a look at it.