Law enforcement agencies across the country use Global Positioning System (GPS) to monitor and track probation, parole, and day-release program participants. Location tracking has proven to be a valuable tool ins support of program participants and the local community. Holding the offender accountable for their activites helps to reduce recidivism and keep them on the path to becoming a productive citizen.

Use the links below to view more information about the specific GPS monitoring devices offered by Sentinel:

How GPS Monitoring Works

How Sentinel GPS Monitoring Works

  • The participant is equipped with a GPS tracking device.
  • The device captures latitude and longitude coordinates from a minimum of four satellites. Location data along with date, timestamp, and rate of travel (speed) are processed.
  • Data is collected by the GPS device and transmitted to the Sentinel National Monitoring Center via cellular communication.
  • Sentinel DNA software stores and reports the device location and status.
  • Based on a predetermined protocol with the agency, officers are notified when a violation has occurred.

For more information about any of our products or services, please call Sentinel  at 800.589.6003 or email us at