Essex is a county in the East of England. The county town is Chelmsford, and the highest point of the county is Chrishall Common near the village of Langley, close to the Hertfordshire border, which reaches 482 feet (147 metres).
The area under the control of the county council, or shire county, is divided into a number of local government districts. They are Harlow, Epping Forest, Brentwood, Basildon, Castle Point, Rochford, Maldon, Chelmsford, Uttlesford, Braintree, Colchester and Tendring.
All wide area and local Police communications are carried out on the UK wide TETRA network called Airwave using a mixture of Motorola, Sepura and EADS radio terminals. This system replaced their previous 150Mhz AM simulcast wide area and local PR UHF systems. Some historic information can be found here: www.dtels.org/html/site_map.htm
Local authority NHS Ambulance services use Airwave, replacing their previous wide area 166Mhz and UHF handheld 'incident' radio systems.
Local authority Fire & Rescue services also use Airwave as their prime method of wide area 'vehicle to control' communications replacing a mixture of FM and AM simulcast systems in the 70Mhz band. At incident Fireground communications are still carried out on simplex UHF frequencies with some cross-band capabilities to Airwave.
Fire & Rescue Services are in the process of migrating to Airwave, some are still operational on 70Mhz.