[Answer] 10. In 1569, the map projection which bears Mercator's name was invented. This map contained perpendicular longitudes and latitudes, and was mainly used by....?

Step 1 : Introduction to the question "10. In 1569, the map projection which bears Mercator's name was invented. This map contained perpendicular longitudes and latitudes, and was mainly used by....?"

...1. seamen 2. the military 3. dukes 4. colleges Only four copies of this map are known to exist.

Step 2 : Answer to the question "10. In 1569, the map projection which bears Mercator's name was invented. This map contained perpendicular longitudes and latitudes, and was mainly used by....?"

seamen:

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