Forced to reduce their activities in the Black Sea, and at war with Venice, the Genoese had turned to north African trade of wheat, olive oil (valued also as energy source) and a search for silver and gold. Europeans had a constant deficit in silver and gold,[23] as coin only went one way: out, spent on eastern trade that was now cut off. Several European mines were exhausted,[24] the lack of bullion leading to the development of a complex banking system to manage the risks in trade (the very first state bank, Banco di San Giorgio, was founded in 1407 at Genoa). Sailing also into the ports of Bruges (Flanders) and England, Genoese communities established then in Portugal,[25] who profited from their enterprise and financial expertise. European sailing had been primarily close to land cabotage, guided by portolan charts. These charts specified proven ocean routes guided by coastal landmarks: sailors departed from a known point, followed a compass heading, and tried to identify their location by its landmarks.[26] For the first oceanic exploration Western Europeans used the compass, progressive new advances in cartography and astronomy. Arab navigation tools like the astrolabe and quadrant were used for celestial navigation. |
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