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What is a Digital Tachograph?
The digital tachograph is composed of a Vehicle Unit (VU) essentially containing a printer, two slots for the cards and a display. It is connected to the gearbox via a secured sensor. The VU is the brain of the system. It is able to hold data in the mass memory on drivers and their periods of driving and duty for about a 12 month period. It also and among others holds data relating to faults, attempts to tamper with the system, over speeding, calibration details, and when data has been accessed, for example, by the Police.
It functions with smart cards. Drivers, companies (operators), workshops (tachograph calibration centres) and enforcement officers (Police for example) have each smart cards according to their specific needs. These enable them to use and / or give access to the data in the VU.

