Dear SMCC,
OXFORD DICTIONARY OF ENGLISH.
DRAW ON: Use one �s (your) experience, talent, or skills, as a resource.
"Sue has a lot of experience to draw on."
Christopher Columbus, (Cristoforo Colombo), was an Italian sailor, navigator, and explorer, who sailed from Spain to the Americas.
Columbus was able to benefit from the knowledge gained from the improvements in modern navigation methods, (of his time, 1492); plus ancient geographical knowledge about the world in general.
I hope that this helps you.
Les Douglas