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With the jacobs staff and quadrant they could measure the sun´s height above the orizon at midday, or that of the north at Star at midnight: there were thereby able to calculate which latitude they were In./The portolan chartswere maps Which had geographic scale and were marked with routes; they made it easier to Use compasses to chech the direction Of the sea when out at sea/The astrolabe Enabled them to use the stars to measure distances and to ckeck the ship´s Latitude as well as the time.The nocturnal was used to measure time at night and also the tides 1.manuscripts to be

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