In the fifteenth century, all of Europe was Christian except for small parts in the south east and south west which were held by people of the Muslim faith.
The Christians in Europe were eager to discover new lands where they hoped to find heathens that they could convert to Christianity and increase the membership of their religion as the Muslims had done in the East.
The compass, astrolabe and quadrants were developed to assist sailors by providing information regarding the direction and position of the ships when sailing.
A new theory that the world was round and not flat emerged, and men such as Columbus believed they could reach the EAST by sailing WEST across the Atlantic.