Adding to what Doug said, the 406Mhz beacons have to be registered to the end user.
Here in Australia, when a 406Mhz signal is recieved the first response is to try and contact the registered contact person for that beacon. This has eliminated a coulple of false alarms so far where kids have been playing with the beacons and the parents didnt know.
No action is initiated until contact is attempted first, this is why it is important to register the beacon, and also to register it in other countries when traveling.