That little blue dot on your map feels like magic. Your phone, with no visible connection to anything, can instantly pinpoint your exact position on a planet of 510 million square kilometers. In our premiere episode, we pull back the curtain on the incredible system that makes it all possible: the Global Positioning System (GPS).Join us as we journey from the constellation of satellites orbiting high above Earth to the tiny receiver in your pocket. You'll learn about the mind-boggling precision of atomic clocks, how your phone plays a game of catch with radio signals, and the clever math (called trilateration) that turns those signals into a precise location. By the end, you'll never look at that blue dot the same way again.

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