Probably the most practical solution for parents
Utah-based Amber Alert GPS (read the full review) strikes an excellent balance between features and cost without sacrificing performance. Amber Alert GPS is a relatively inexpensive solution that can track indoors and out, has an SOS button to call for help, supports Geo-Fencing, and can send speed alerts (ie. send an alert if my kid is driving faster than 80 MPH) -- all for under $200. The monthly service costs between $19.99 to $49.99, depending on usage.
Amber Alert GPS uses the same high-performance GPS found in the much more expensive WorldTracker GPRS, and provided similarly excellent indoor tracking performance. Amber Alert GPS doesn't have all the bells and whistles of the more expensive devices, but it does provide parents with an easy way to quickly locate their child, indoors or out, without breaking the bank.
The SOS button is also a nice feature that lets kids send help messages to up to 5 people at once.
To get the most out of Amber Alert GPS you'll need an internet-enabled smartphone such as a Blackberry, iPhone, or Windows Mobile phone.
The Jim Gamble mantra, 'Think of the children'
Is it ONLY a question of time ?