Justin O'Beirne A couple of months ago, Justin O'Beirne, a map expert who helped work on Apple Maps, was using Google Maps when he noticed something different: Google had dramatically reduced the number of readily visible cities on its maps, opting instead to prioritize highways and other means of transportation.

Given the sharp reduction, O'Beirne said in an email to Business Insider, he wanted to compare his findings with Apple Maps.

O'Beirne found that not only did Apple show three to four times as many cities on its program, but the two maps diverged in several other key areas as well.

After studying how the two maps represented three major cities: London, New York, and San Francisco, O'Beirne found that Google Maps heavily labeled transit, while Apple Maps prioritized landmarks, ultimately presenting two different worldviews.

In the first installment of a four-part blog series about the difference between the two maps, O'Beirne provided these side-by-side screenshots of Manhattan as shown in Google Maps and Apple Maps at varying degrees of zoom:

Justin O'Beirne

Justin O'Beirne

Justin O'Beirne

Even though each map shows a similar number of points of interest, the overlap was only about 15%.

In particular, O'Bierne found that Apple showed twice as many restaurants and shops as Google. He noted that Google's design emphasizes utility, while Apple emphasizes a tourist-friendly experience.

"Both maps have strengths and weaknesses, and it's hard to say which is better," O'Beirne said. "It's kind of similar to driving in a foreign country: driving on the other side of the road isn't necessarily better ... it's just different."

He believes we are rapidly approaching the day when most of the world's population uses the same map, a so-called universal map.

"I think the Universal Map is significant because there's nothing else like it in history," O'Beirne said. "If we think of the map as a 'document' (as we would with a traditional paper map), Google Maps has to be one of the most widely read documents in history."

O'Beirne said the company that achieves the status of universal map stood to gain a lot, as its map design has the power to create our shared picture of the world.

"Looking at the differences also helped me understand each map's weaknesses — and I'm very interested in making something that tops both," O'Beirne said.