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TrackerPAL is a recently released violator monitoring system that combines GPS, computer, and cell-phone technology into one miniscule unit fueled by a 20-hour battery.

The waterproof gadget straps to a violator's ankle and monitors his or her movements, using GPS technology.

At an around-the-clock monitoring center in Sandy, UT, workers follow dozens of violators' locations. If the offenders go someplace they are not allowed, an alert appears on the screen.

The TrackerPAL's cell unit permits operators and violators to speak with each other and can notify police or probation officers. In addition, the device emits a 95-decibel siren if the violator wanders into a prohibited area or is hiding when authorities are looking for him.

The software can be authorized to include off-limits locations, such as schools and parks. Although a violator can be followed to within 50 meters, TrackerPAL is restricted in that urban settings can cause signal problems.
Abstracted by the National Law Enforcement and Corrections Technology Center (NLECTC) from the Deseret (UT) Morning News (06/03/07); Winslow, Ben.