Mobile data terminals, Mobile Data Terminal (MDT), are dedicated terminals for special mobile radio networks or services. They are used in the BOS radio, in Tetra and Tetrapol, where they take over the communication
in military vehicles, fire brigades and police cars, in cars of the disaster control and rescue services as mobile data terminals and display the location data. Mobile data terminals have a display and a keyboard to enter data, and are connected to various peripheral devices such as a navigation device, automatic vehicle locator or taximeter. If the first MDT devices were dumb terminals, the current MDTs are equipped with processors. Therefore, they are usually referred to as Mobile Data Computers (MDC).