Before revision: 250px|Analogue Tachograph 250px| The Tachograph Chart A tachograph is a device fitted to a vehicle that automatically records its speed and distance, together with the driver's activity selected from a choice of modes.
After revision: 250px|Analogue tachograph 250px| Tachograph chart A tachograph is a device fitted to a vehicle that automatically records its speed and distance, together with the driver's activity selected from a choice of modes.