Another 30-plus brands of tracking devices for cars and kids are all run on another Shenzhen-based platform known as NewGPS2012. Combined with another major GPS platform known as SinoTrack that sells car trackers and smartwatches, the two researchers found that tens of millions of GPS tracker gadgets came from just three supply chains. (Once the GPS started working on the smartwatch WIRED tested, the hackers showed that feature, too, could be hijacked to follow the wearer’s every move.) “Millions of kids are being exposed and vulnerable to exploitation. The Watches Watching Your KidsThe researchers say they’ve been warning the companies behind all three Shenzhen-based GPS platforms about their vulnerabilities for months.