Gerardus Mercator (1512)

Mercator was a Flemish geographer, mathematician, and who perfected the first map using the Mercator projection, the translation of the spherical earth to a two-dimensional flat plane. In it, parallels and meridians are rendered as straight lines spaced to produce an accurate ratio of latitude to longitude at any point. It permits mariners to steer a course over long distances without continually adjusting compass readings.

What map-related term was coined by Mercator?
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