Buddi is a discreet GPS tracking service that can be used to accurately pinpoint an individual's whereabouts.

The device is already used by health services and local authorities, but through Reboot Britain the service was adapted by Hertfordshire Police with the help of persistent offenders who volunteered to trial the tag as an alternative to prison custody.

Traditional electronic monitoring technologies only monitor whether an offender has complied with the conditions of their curfew, and do not provide information about location.

The Buddi tag collects a much more comprehensive daily data trail that can be mapped to show exactly where offenders are at a given point of time.

The information is also used to support rehabilitation and help offenders change their behaviour. In face to face meetings, offenders review the data trail with their supervisors to identify patterns in their lifestyle and then think about what they need to do differently to reduce the likelihood they will reoffend in the future.