HMPPS has failed to provide police forces and the Probation Service with timely access to the tagging information they need to effectively supervise offenders and protect the public. HMPPS expected Gemini and the user portal to enhance probation officers’ supervision of offenders and improve public protection by providing: a single version of case management records; improved management information and reporting capabilities; and crucially, access to historical and real- time maps of offenders’ movements by using GPS tags. Without this system, police and probation officers cannot access real-time data and have to submit manual requests for location data, which limits the value of using GPS tracking. However, HMPPS’s acquisitive crime pilot—which involves comparing data from GPS tags against the locations of alleged crimes submitted by the police—has enabled probation officers to have real-time access to location data for the 650 offenders in the pilot. HMPPS has received requests from the police for direct access to its system, but it has so far not provided this due to data protection considerations. Recommendation: Before starting future contracts in January 2024, HMPPS should explore how it can provide police forces and other law enforcement agencies with real-time access to location monitoring data across all GPS tagging cohorts —taking account of data protection considerations—and update us on its plans.