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  Was used for navigating. It used a magnetic needle attracted to the two poles.
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  The astrolabe helps sailors map the sun and stars so they could guide were they were going.
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  The Caravel was a faster more efficient ship. This helped exploration because it was fast and held extra cargo than previous ships.
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  Christians wanted to spread the word of God, so they began to travel.
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  Prince Henry founds a navigational school. The school helped with map making, sailing, and boat making.
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  The invention of the printing press allowed maps to be distributed quickly, and more people could explore.
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  Christopher Columbus convinced Spain to let him sail. HE tried to get to Asia for cargo in high demand.
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  The land Spain and Portugal fought over was separated by the pope. This was the line of demarcation. Both country's agreed to this, and the Treaty of Tordesillas.
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  Dias finds a way to sail around the southern tip of Africa on his way to India
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  Vasco de Gama sails to India. He returns home with precious cargo, and a tense relationship.