For many, mapping apps have made knowing one's way around, or even trying to use a real map irrelevant. Yet in London, aspiring cab drivers still have to take what’s known as “the Knowledge Test” showing that they know every single road in the city. Jesse visits with a London black cab driver to see what it’s like to still know where you're going, Carmen tries to convince her dad, who has never used Google Maps, to get his directions online, and they both go back to school to talk with a geography professor to explore the sweet spot between online and offline maps.

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