| 11. | I explained in 2011 at the " Portolan chart " talk page here the purpose of my pages:
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| 12. | The production of medieval Portolan charts can be divided in two major schools : the Italian and the Catalan.
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| 13. | The island makes its first explicit appearance as a large rectangular island in the 1424 portolan chart of Zuane Pizzigano.
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| 14. | With each sheet at 11 cm x 16 cm, making it the smallest portolan chart from the period still extant.
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| 15. | The wealth of detail contained in portolano handbooks is reflected in the portolan charts, stunningly accurate even by modern standards.
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| 16. | Course of the " River of Gold " ( Senegal-Niger ) in the 1413 portolan chart of Mecia de Viladestes.
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| 17. | Trickett claims that the French Vallard maps were composed of several portolan charts that were incorrectly assembled from now lost Portuguese charts.
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| 18. | Nordenskiold ), the Majorcans were responsible for the invention ( c . 1300 ) of the " normal portolan chart ".
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| 19. | Both Majorca and Genoa have laid claim for the invention of the portolan chart, and it is unlikely this will ever be resolved.
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| 20. | I ran across a collection of articles on medieval portolan charts being kept in this user's userspace here : User : Portolanero.
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