By about 1330 Britain had changed from the rough rectangle of the carte pisane to more or less recognisable shape, Ireland had been added and the continental coast extended from Frisia beyond Jutland, with the Danish islands and Gotland making anThe Carte Pisane holds an unusual distinction in the history of mapping Although it is the earliest portolan chart extant, the Carte Pisane has all of the same physical and intellectual characteristics of the portolan charts that come after it Rather than being the first of its kind, the Carte Pisane is believed to be the result of a long period of development that has left no known material evidence and may have extended to near the beginning of the 13th century, when the marine compass was already in use and the first prototypes based on compass directions were likely created
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