The Genoese map is a 1457 world map

World map

A world map is a map of the surface of the Earth, which may be made using any of a number of different map projections. A map projection is any method of representing the surface of a sphere or other three-dimensional body on a plane....

. The map relied extensively on the account of the traveler to Asia Niccolo da Conti

Niccolò Da Conti

Niccolò de' Conti was an Italian merchant and explorer of the Republic of Venice, born in Chioggia, who traveled to India and Southeast Asia, and possibly to Southern China, during the early 15th century...

, rather than the usual source of Marco Polo

Marco Polo

Marco Polo was a Venetian merchant traveler from the Venetian Republic whose travels are recorded in Il Milione, a book which did much to introduce Europeans to Central Asia and China. He learned about trading whilst his father and uncle, Niccolò and Maffeo, travelled through Asia and apparently...

. The author is not known, but is a more modern development than the Fra Mauro world map

Fra Mauro map

The Fra Mauro map, "considered the greatest memorial of medieval cartography" according to Roberto Almagià, is a map made around 1450 by the Venetian monk Fra Mauro...

, with fairly good proportions given to each continents. The map also depicts a three-masted European ship in the Indian Ocean

Indian Ocean

The Indian Ocean is the third largest of the world's oceanic divisions, covering approximately 20% of the water on the Earth's surface. It is bounded on the north by the Indian Subcontinent and Arabian Peninsula ; on the west by eastern Africa; on the east by Indochina, the Sunda Islands, and...

, something which had not occurred yet at the time.