The printed Maphover map uses the Gall stereographic map projection, which is a slightly modified version of the traditional Mercator map. The Mercartor map projection is the most common map projection in the World. Even Google uses it. Its success came from revolutionising navigation. It was the first map that made ship navigation easy. This popularity helped the map spread from nautical decks and into atlas’ and classrooms world wide. Some map purists state that the mercartor map projection is inaccurate. So the question is – If it’s so bad, why do we keep using it? Let’s take a look at the history of the Mercator projection along with its advantages and disadvantages. Our earth is spherical (not a perfect sphere though). Therefore all the continents are arranged on a spherical shape. However most of our maps are printed on rectangular paper. And spherical objects don’t perfectly translate to rectangular shapes. We can’t 100% transpose a spherical map into a rectangular map without sacrificing some detail. So, in order to make a rectangular map, we need to make changes that preference some aspects of the spherical map over others. And it’s these preferences that are debated and critisised by map cartographers around the world. Here’s an animation showing how the world’s sphere is divided and modified to fit within a rectangular Mercator map projection: Source.