OK. We can clearly see these are bad maps. But how to know you're looking at a good one? Brant Scheidecker, a sales engineer at Cartegraph, highlighted some of the main essentials for accurate and easily interpretable map use.

"Every map should have a title. It allows the user to assess the purpose of the map quickly; allowing them to determine if it meets their needs," Scheidecker wrote.

Next, origin. A fancy name for a compass or the North arrow. "This allows the user to determine the maps reference to the earth. While most maps these days have North being straight up, occasionally you will encounter a map that has a skewed orientation, perhaps to better fit it on the physical medium it's presented on (i.e. paper), or simply because it’s easier to interact with the map in that orientation."

When it comes to the source, it's a two-fold element. "It allows the map maker to provide the map viewer an idea where the data the map is representing is from; a necessity in determining the accuracy of a map. It also allows the map maker a way to cite the source of their data, avoiding all those pesky cries of plagiarism and the ensuing lawsuits," Scheidecker explained. "You have better uses for your time, like ensuring the rest of the T.O.S.S.L.A.D. elements are on your maps."

Let's not forget the legend (the area where a user can determine what a particular color or symbol represents on the map). "Without a legend, a user cannot successfully interpret what your map is trying to represent, 'Does the red skull and crossbones over my favorite restaurant mean what I think it means?'"

You should also know when was the map that you're analyzing made. If it was created in 1962 and shows commuter levels in Chicago—it might not be such a valid source for the traffic data you are looking for today, unless you are feeling nostalgic, Scheidecker joked.

There you have it. You may now have become a cartographic genius, but you should be able to tell if you're looking at a terrible map or not!