Securing your world

Electronic Monitoring

G4S Electronic Monitoring Services (EMS) offers offender electronic monitoring systems sales, support and consulting services worldwide.

G4S is one of the world's largest authorities on offender electronic monitoring technologies and monitoring services. G4S has the skills and experience to provide the right solution from Electronic Monitoring technology to full turnkey systems including program design and monitoring services.

In Australia G4S continues to respond to rapidly expanding growth in this sector, providing new and innovative technologies including alcohol monitoring. The recent establishment of our 24 hour Electronic Monitoring Centre in Melbourne provides customers with specialist monitoring staff and the latest monitoring and response software.


G4S provides both Solo (GPS) and PID (Radio Frequency) devices which are hermetically sealed, fully waterproof and operate normally within an expected temperature range. SOLO (GPS) devices are the smallest and lightest one-piece fully approved offender tracking device in the world. The state-of-the-art chipset uses A-GPS technology to produce precise and reliable location data and the device supports multiple, time-dependant tracker zones. SOLO can be used on its own, although it can be combined with a Monitoring Unit to create a combined Offender Tracking and Home Monitoring system. PID (Radio Frequency) devices are securely fitted around the offender’s ankle and a Monitoring Unit is installed at the curfew address and / or place of work. Installation is quick and simple to do using a single tool.

24 Hour Monitoring Centre

The establishment of our 24 hour Electronic Monitoring Centre in Melbourne provides customers with a professional and proactive service relating to all aspects of the management of monitored offenders. This includes specialised help desk support and equipment as well as fully comprehensive monitoring training. G4S monitoring staff are highly experienced in the latest monitoring and response software CHRONOS - an offender tracking system that provides a user friendly application that utilises near real-time monitoring.