Diagram of Admiral Zheng He’s Navigational Chart, 15th Century
This chart by an unknown author shows the navigational route that was taken by Admiral Zheng He from Hormuz in southwest Asia to go to Calicut, India that is described by Ma Huan here. It will help students ascertain many of the details made by the Chinese explorers in this period to arrive in Calicut and elsewhere in the Indian Ocean in this period.
Mills, J.V.G. (1970). Ying-yai Sheng-lan: 'The Overall Survey of the Ocean's Shores' . pp. 335–346.