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Most of us use GPS—the Global Positioning System—on a daily basis: to find our location when we’re driving, running, shopping, dating, and so much more. But GPS is even more important, and more vulnerable, than you think.

In the last few years, GPS interference has been reported all over the world, from war zones to shipping routes to public squares. What was once the fanciful plot of a Bond movie—bad guy manipulates GPS to start World War III—is increasingly plausible. How did the world come to rely so heavily on such an unreliable system?

In this episode of Decoder Ring, host Willa Paskin talks to journalist Katherine Dunn, author of the new book Little Blue Dot: How GPS Shaped the Modern World. You’ll learn how GPS works, why it was created, how it became so ubiquitous, and why it’s now under attack. You’ll also hear from Dr. Todd Humphreys, an aerospace engineer who manipulated GPS to trick an $85 million superyacht into following his direction—for science, of course.

This episode was written and produced by Max Freedman. It was edited by Willa Paskin and Evan Chung, our supervising producer. Merritt Jacob is Senior Technical Director. Our intern is Phoebe Mulder.

If you have any cultural mysteries you want us to decode, email us at DecoderRing@slate.com or leave a message on our hotline at (347) 460-7281.

Sources for This Episode
Burgess, Matt. “When a tanker vanishes, all the evidence points to Russia,” WIRED, Sep. 21, 2017.
Dunn, Katherine. Little Blue Dot: How GPS Shaped the Modern World, Bloomsbury Publishing, 2026.
Dunn, Katherine. “How to Hack a Superyacht,” The Walrus, Jun. 13, 2026.
Hopper, Nate. “The Thorny Problem of Keeping the Internet’s Time,” The New Yorker, Sep. 30, 2022.
Hopper, Nate. “The Timekeeper of Ukraine,” The Atlantic, Sep. 21, 2024.
Hosted on Acast. See acast.com/privacy for more information.

Most of us use GPS—the Global Positioning System—on a daily basis: to find our location when we’re driving, running, shopping, dating, and so much more. But GPS is even more important, and more vulnerable, than you think.

In the last few years, GPS interference has been reported all over the world, from war zones to shipping routes to public squares. What was once the fanciful plot of a Bond movie—bad guy manipulates GPS to start World War III—is increasingly plausible. How did the world come to rely so heavily on such an unreliable system?

In this episode of Decoder Ring, host Willa Paskin talks to journalist Katherine Dunn, author of the new book Little Blue Dot: How GPS Shaped the Modern World. You’ll learn how GPS works, why it was created, how it became so ubiquitous, and why it’s now under attack. You’ll also hear from Dr. Todd Humphreys, an aerospace engineer who manipulated GPS to trick an $85 million superyacht into following his direction—for science, of course.

This episode was written and produced by Max Freedman. It was edited by Willa Paskin and Evan Chung, our supervising producer. Merritt Jacob is Senior Technical Director. Our intern is Phoebe Mulder.

If you have any cultural mysteries you want us to decode, email us at DecoderRing@slate.com or leave a message on our hotline at (347) 460-7281.

Get more of Decoder Ring with Slate Plus! Join for exclusive bonus episodes of Decoder Ring and ad-free listening on all your favorite Slate podcasts. Subscribe from the Decoder Ring show page on Apple Podcasts or Spotify. Or, visit slate.com/decoderplus for access wherever you listen.

Sources for This Episode
Burgess, Matt. “When a tanker vanishes, all the evidence points to Russia,” WIRED, Sep. 21, 2017.
Dunn, Katherine. Little Blue Dot: How GPS Shaped the Modern World, Bloomsbury Publishing, 2026.
Dunn, Katherine. “How to Hack a Superyacht,” The Walrus, Jun. 13, 2026.
Hopper, Nate. “The Thorny Problem of Keeping the Internet’s Time,” The New Yorker, Sep. 30, 2022.
Hopper, Nate. “The Timekeeper of Ukraine,” The Atlantic, Sep. 21, 2024.
Hosted on Acast. See acast.com/privacy for more information.

Todd Blanche’s hearing to become US Attorney General has begun. With a resume that includes the president’s $1.8 billion slush fund and, uh, the “handling” of the Epstein files, what could they possibly have to talk about?

Guest: Harry Litman, former US attorney, former deputy assistant attorney general, host of Talking Feds, the podcast and Substack.

Want more What Next? Subscribe to Slate Plus to access ad-free listening to the whole What Next family and across all your favorite Slate podcasts. Subscribe today on Apple Podcasts by clicking “Try Free” at the top of our show page. Sign up now at slate.com/whatnextplus to get access wherever you listen.

Podcast production by Rob Gunther, Evan Campbell, Madeline Thames-Ducharme and Patrick Fort.

Paige Osburn is the senior supervising producer of What Next and What Next TBD.
Hosted on Acast. See acast.com/privacy for more information.

Platforms like Kalshi and Polymarket have expanded from letting people bet on just sports to everything from political events to reality TV, and even the weather. But by injecting financial incentives into things like disease outbreaks, we’re even more susceptible to bad actors and manipulation. On today’s episode, host Kate Lindsay is joined by creator Austin Evans to talk about the spread of prediction markets, and how a tool once believed to help us make sense of society ended up making everything even more chaotic.

***GET TICKETS TO OUR LIVE SHOW HERE!!!!***

This podcast is produced by Vic Whitley-Berry, Daisy Rosario, and Kate Lindsay.
Hosted on Acast. See acast.com/privacy for more information.

As the killing of Lorenzo Salgado Araujo in Houston demonstrates, ICE’s deportation surge is continuing—and so is the violence.

Guest: Arelis Hernández, reporter at the Washington Post covering the U.S. southern border, immigration, Texas and beyond.

Want more What Next? Subscribe to Slate Plus to access ad-free listening to the whole What Next family and across all your favorite Slate podcasts. Subscribe today on Apple Podcasts by clicking “Try Free” at the top of our show page. Sign up now at slate.com/whatnextplus to get access wherever you listen.

Podcast production by Rob Gunther, Evan Campbell, Madeline Thames-Ducharme and Patrick Fort.

Paige Osburn is the senior supervising producer of What Next and What Next TBD.
Hosted on Acast. See acast.com/privacy for more information.