The Billund, Denmark, Legoland uses KidSpotter to track children in the park, if parents want: For a rental fee, parents can Wi-Fi enable their children preventing their unintentional loss across the 10-hectare (25 acre) theme park. If your child disappears, the parent uses SMS with their child's number, and they're providing with exact location information in response. It's the largest location-based Wi-Fi network in the world, the release says, meaning it's the largest network of its kind in which you can track items within it.
Bluesoft's technology is behind Kidspotter. They separately announced today that their Wi-Fi/radio frequency ID (RFID) tracking technology AeroScout WLAN Location is available for tracking all kinds of valuable assets (not just children) with precise location information across Wi-Fi networks. Because of the high per-unit cost, the company lists applications like tracking people, cars, and containers.