How many maritime incidents have occurred in history?

/kloc-the 0/5th century was a period of great development of east-west navigation. From 1405 to 1433, Zheng He, a China navigator, led a fleet of seven voyages to the Western Ocean, and sailed to Somali and Kenyan areas on the east coast of Africa after more than 30 countries and regions, which became a pioneering work in the history of navigation in China. 1420, Portugal founded the navigation school; Captain Diaz sailed to the southernmost tip of Africa on 1487 and named it the Cape of Good Hope. 1497, the gamma rate fleet set off from Lisbon and bypassed the Cape of Good Hope to reach India. Since then, the Portuguese have arrived in China and Japan. 1492 10 the Italian navigator Columbus discovered America. From 1499 to 1500, the Italian navigator Amerigo visited the American continent twice, which confirmed that this land was a newly discovered land, not an Indian island that Columbus thought at that time, so he named this new continent Americana, or America for short. Since the beginning of16th century, navigation technology has developed rapidly. The projection invented by geographer Mercator in 1569 became the basis of modern chart drawing. After entering the 20th century, modern navigation technology has made great achievements. Omega navigation system appeared in 1960s, followed by satellite navigation system and automatic plotting radar.

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