Many law enforcement agencies across North America use Global Positioning System (GPS) to monitor and track probation,  parole or day-release program participant activity. GPS monitoring has proven to be a valuable tool to help ensure that a participant remains within a certain area or out of restricted locations. This supports a healthy and safe community for all.

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

How GPS Monitoring Works

Here’s How Sentinel GPS Monitoring Works

  • The participant is equipped with a GPS tracking device
  • The GPS device captures latitude and longitude coordinates from a minimum of four satellites. Location data along with the date, timestamp, and rate of travel (speed) are processed
  • Data is collected by the GPS device and transmitted to our National Monitoring Center via cellular towers
  • Sentinel’s proprietary Sentrak software determines the device’s location and reports the device’s status
  • Based on a predetermined protocol from the agency, officers are notified if 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