GPS Is a Clock, Not a Map! Here's Why

Every day, 30 atomic clocks orbit Earth to broadcast the exact time. Here’s why GPS isn't actually a navigation map—and why modern society breaks down without it. In January 2016, fifteen GPS satellites sent out one tiny number wrong, and alarms started going off. Maps kept working, so why did it matter? Because GPS isn't really a map. It's a clock. How does GPS actually work? About thirty satellites constantly broadcast the exact time and where they are. Your phone turns tiny delays into distances, the same way you count the seconds between lightning and thunder. Along the way: why Einstein's relativity has to be corrected for, how a 1983 tragedy sped up civilian GPS, and what happens when the clock goes wrong. 0:00 The day GPS got the time wrong 0:39 Thirty satellites shouting the time 1:37 The thunder trick 3:30 Einstein's correction 4:47 From military system to the world's clock 6:36 When the clock goes wrong 7:56 It was time Sources GPS.gov, timing applications: https://www.gps.gov/applications/timing Neil Ashby, "Relativity and the Global Positioning System": https://www.aapt.org/doorway/tgru/art... Nextgov, how the 1983 KAL 007 crash sped up civilian GPS: https://nextgov.com/digital-governmen... Inside GNSS, the January 2016 GPS timing error: https://insidegnss.com/bbc-chronos-re... SVT, interference affecting flights in the Baltic region: https://www.svt.se/nyheter/inrikes/12... NIST (2019), economic benefits of GPS: https://www.nist.gov/news-events/news... #GPS #HowThingsWork #Science