France's Carrier Tracked in Real Time via Fitness App
French newspaper Le Monde reported it was able to locate and track the French aircraft carrier Charles de Gaulle in real time using data from a popular consumer fitness app, rather than satellite imagery or signals intelligence. According to the report, sailors jogging on the ship's deck while using the app generated GPS data that, when aggregated, revealed the carrier's position at sea.
Per Le Monde's account, the giveaway was a distinctive cluster of jogging activity confined to a roughly 261-meter loop — matching the deck length of the carrier — moving steadily across open water far from any landmass. That pattern was enough to isolate and confirm the ship's location.
The episode echoes the 2018 Strava Global Heatmap controversy, in which aggregated fitness-tracking data inadvertently exposed the locations and patrol routes of secret military bases. The recurring problem is the same: individually innocuous, seemingly anonymized location data can reveal sensitive patterns when aggregated at scale.
The incident raises fresh questions for military OPSEC policy. Personal fitness trackers and smartphones remain common among service members despite years of warnings following the Strava heatmap revelations, and Le Monde's report suggests that risk has not gone away. Outright bans on personal devices are difficult to enforce for morale reasons, but the report underscores that existing safeguards against this kind of data leakage remain inadequate.