Bluetooth tracker hidden in a postcard and mailed to a warship exposed its location — $5 gadget put a $585 million Dutch ship at risk for 24 hours | Tom’s Hardware

A Bluetooth tracker hidden inside a postcard and mailed to the Dutch warship HNLMS Evertsen exposed its location for 24 hours, putting the $585 million ship and its NATO carrier strike group at risk. The Dutch Ministry of Defense has since banned electronic greeting cards, and similar incidents involving Strava and unauthorized Starlink terminals highlight ongoing operational security challenges with new technologies.