The Uniden BC346XT Analog TrunkTracker III Scanner with Dynamic Memory Architecture is a type of hand held scanner used by the Police, the Fire Department, meteorologists, ham radio operators, corporate security, taxi cabs to monitor communications on assigned frequencies. In addition to 9000 conventional channels, the Trunk Tracker III digital scanning lets you monitor Motorola, EDACS and LTR systems. With a scan rate of 100 channels per second, the Uniden handheld scanner provides for system/channel tagging that give quick access to specific channels. Each trunked system handles 500 talk groups. You can flag a system as private so that it cannot be accessed or modified out of the scanner. Control channel data can be analyzed without modifications to the scanner. This GPS scanner allows you to make location based scans.