Posted by cara on Wednesday, December 9, 2009 at 5:42pm.
Bartolomeu Perestrello is maybe who you are refering to.
http://en.wikipedia.org/wiki/Bartolomeu_Perestrello
In those times, many merchantmen did trade with faraway places, and as a necessity, created navigation charts to sail into the unknown. Navigation was in its beginnings in those days.
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