Police in Norfolk, England already have tracking units, The Automatic Vehicle Location System, installed in their cars that allow a control room to track their exact locations. Later this year a similar system will be attached to individual police radios to allow controllers to monitor the position of every frontline officer. Combined with equipment that can pinpoint the locations of 999 callers, the system will allow the force to home in on "shouts" to within yards. The system also lets operators filter a map showing the location of its vehicles and constables to reveal only those with the skills needed for a specific incident, like the closest officer with silver bullets during a werewolf attack.