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The Global Positioning System (GPS) is a sophisticated tracking method that operates via a network of low-orbit satellites. These satellites use radio signals in concert with a cellular telephone and an ankle bracelet to pinpoint the targeted individual’s position within 100 feet. The participant must wear an ankle bracelet (which is not removable once affixed) and must carry a 4-pound box, about the size of a small radio. A GPS receiver is located inside the box and uses the cell phone to call location information into the monitoring station. This cell phone/satellite technology does not require a telephone line and the participant is therefore free to find and maintain gainful employment.
Any location that the participant has been ordered to stay away from may be programmed into the system. A computerized map located at the monitoring station sets off a warning signal if the participant gets too close to a banned area, or if the participant moves away from an area in which he/she should remain.GPS places responsibility for appropriate behavior with the participant, but provides 24-hour monitoring to ensure compliance.
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