Missing Map: “The Physics of GPS” Link on Hacker News Leads to a 404

A Hacker News link to an explainer titled "The Physics of GPS" now lands on a dead page. The perthirtysix.com URL returns the message, "Sorry, we couldn’t find the page you’re looking for." It has been reported that readers who clicked expecting a clear, technical walkthrough instead found nothing but a shrug from the server. Where did the explainer go? Short answer: we don’t know.

The vanished explainer — and what it likely covered

The original link allegedly pointed to an article that broke down how GPS actually works: atomic clocks in satellites, time-stamped radio signals, trilateration in three dimensions, and the pesky corrections engineers must apply for both special and general relativity. Those physics facts are not rumor — GPS satellites do broadcast precise time, receivers compute distance from signal travel time, and relativistic effects require a net correction of about 38.5 microseconds per day to keep positioning accurate to within meters. But whether the now-missing PerthThirtySix piece framed those points in an accessible way can’t be verified from the broken link.

Why a missing technical explainer matters

This is more than a 404 blip. Tech communities depend on shared explainers to spread understanding; link rot erodes that collective memory. It’s a small, infuriating cultural moment: we rely on GPS to not get lost, and yet the map to its inner workings vanished. If you clicked through from Hacker News, try the Wayback Machine or thread comments — readers often paste summaries when a source dies. It has been reported that such backups and comment summaries sometimes save the day.

If you wrote or hosted the missing piece, consider reposting or sharing a snapshot. If you’re a reader, save the good explainers while you can — this is digital survival of the fittest.

Sources: perthirtysix.com, Hacker News