Answer: b. Direction is constant across the map.
Explanation:
The Mercator map projection is a cartographic chart of the Earth's surface. It was produced by Gerardus Mercator in 1569. This map shows the distances between the meridians in straight lines but creates distortions when the marked lines approach the poles due to the map's poor ability to resemble the actual shape of the earth.
However, these straight and uninterrupted lines allow the production of constant nautical charts for maritime navigation. Therefore this map has been used over the years.
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