CatTRAX™ - Cattrax™ for Families What a great and unique service. Buy a phone and register it with this service. Give the phone to your kids. That's it. Now, when you want to know where they are, just call up and ask. You can track them with the help of the on-board GPS transceiver. This can not only tell you location, it is integrated with the national registry for predators. This means, if you child strays into a neighborhood where a registered sex offender lives, you can be alerted. In addition to this, once your child begins to drive a car, you can be alerted when they are speeding. Could help reduce the possibility of an accident.