Verdict: Like Having Your Own Personal Spy Satellite
The WorldTracker GPRS is a portable, Assisted-GPS tracking device capable of sending real-time position reports every 15 seconds. The battery operated device sells for around $650, works indoors and out, operates on the the GSM network, sports a high-performance SiRF StarIII receiver, is water resistant, and can alert if you if the device moves into or out of a pre-defined area.
Note that Brickhouse Security also sells this same device under the name "W-Trac GPRS".
Is the WorldTracker GPRS the ultimate child/teen/adult/vehicle tracking device and worth the hefty price tag? Read on.