RFID Journal provides the detail on Legoland's kid-tracking Wi-Fi hardware: The magazine provides piles of additional detail about the Denmark theme park's system to let parents find their children if lost. The system combines BlueSoft's AeroScout system with software by KidSpotter, which on its Web site, is more explicit that the system can be used to track visitors patterns for better park optimization.
About 1,600 children or 0.1 percent of the 1.6 million visitors, become separated from parents each year, so it's a small but significant problem. The rental fee is €3 per day; the entrance fee is mid-€20s. The park is installing 38 AeroScout units which cost from $3,000 to $4,000 each. The tags themselves cost about $85 each and the park is starting with 500 of them.
Not mentioned in this article is that the tags use very tiny amounts of one-way signalling which allows their batteries to last for years.