"It was made by dudes in the 1500's that thought the Earth was flat. Columbus called indians "Indians" because he thought he was in India."

Exactly "made by dudes in the 1500's that thought the Earth was flat" they had very limited first hand knowledge of world geography because they had not been to most of it by 1500. It means that maps existed which were pretty accurate depicting lands which were never seen by navigators in the 1500's yet the maps existed from 100's of years or even thousands of years earlier. Its alleged that Columbus had access to Knights Templar maps which were made from maps that they found in the Holly Lands in the first crusade.