The rise in mobile navigation technology has, in just a few years, transformed the way we get around cities. In 2011, 35 percent of Americans had smartphones; by 2013, that had grown to 61 percent. Three-quarters of those people now use their phones for directions and location-based services. One in five Americans used the Google Maps app in June; one in eight used Apple Maps. Tens of millions more rely on car-based modules hitched to the satellites of the Global Positioning System. Experts who study the issue are concerned that spatial thinking might be the next casualty of technological progress, another cognitive ability surpassed and then supplanted by the cerebral annex of the Internet. Read more in The Atlantic CityLab