Pity they didn't make it a few years earlier and sell a copy to that klutz Columbus.
Columbus sailed to Hispaniola (DR+Haiti today) in 1492; the maps date from 1421 onward.
It is indeed argued that he used copies of Chinese maps.
What I don't grasp is how, if he had such a map, he mistook the American continent for India.
An alternate explanation that comes to mind is that he sooner trusted the Norsemen's Vinland map, which has now been confirmed as authentic.
On Columbus himself, he was not a nice man.