Law enforcement and corrections administrators tasked with implementing electronic monitoring programs can find information that may help them make procurement decisions in a study conducted with NIJ funding. The Market Survey of Location-Based Offender Tracking Technologies, Version 1.1 (NCJ 249889) compares information on 13 commercially available systems including: product details, functionality, and warranty information, as well as provides information on training and assistance, and system performance and security. Agencies seeking to implement such systems may also want to review GPS Monitoring Practices in Community Supervision and the Potential Impact of Advanced Analytics, Version 1.0 (NCJ 249888). This study assess the potential for using advanced analytics to enhance the capabilities of such systems and provides a summary of the analytics capabilities of commercially available software. These reports provide an overview of commercially available technology at the time of publication. Agencies seeking to implement such systems may also want to consider NIJ Standard-1004.00 Criminal Justice Offender Tracking Standard (NCJ 249810). The standard provides minimum performance requirements that agencies may want to consider incorporating into their procurement specifications. It was developed for NIJ by a special technical committee composed of expert practitioners representing such diverse agencies as the California Department of Corrections and Rehabilitation and the Harris County (TX) Pretrial Services, as well as scientists and experts in performance testing and conformity assessment.