Tracking, monitoring, and locating persons via a portable electronic device which receives and transmits location data from a Global Positioning System (GPS) system or radio frequency system; Monitoring services for tracking the location of people for law enforcement purposes and to ensure public safety using GPS and Radio Frequency (RF) transceivers; Providing community supervision and tracking of individuals for law enforcement agencies, namely, monitoring the location of individuals released from detention after posting bond, released from incarceration on probation, or serving alternative sentencing for purposes of law enforcement and public safety using GPS and RF devices; Monitoring of individuals for law enforcement agencies, namely, monitoring the location of persons under house arrest, or on pre-trial, probationer, or parolee status for purposes of law enforcement and public safety using GPS and RF devices; Providing an on-line searchable database for law enforcement surveillance and investigation purposes featuring location and movement information regarding individuals monitored using GPS and RF tracking devices