Odometer errors are typically proportional to speedometer errors. Most road motorcycles have an instrument panel, usually consisting of speedometer, odometer and tachometer. The lower dashboard has an analog tachometer and digital odometer. Most modern cars include a trip meter (trip odometer). A taffrail log is a mechanical speed logging device, used like a car odometer. The car has approximately on its odometer. Critics point out the possibility of cheating the system by odometer tampering. A local dealer verified the odometer reading. The Envoy had 24,300 miles on its odometer when he bought it. Though not an odometer, the "pascaline" utilized gears to compute measurements. For 2002, the instrument panel was updated, receiving a digital odometer. Customers keep track of miles on their own odometer to know when to buy more. In transport, great progress resulted from the invention of the winch and the odometer. Discovering many more miles on the odometer, Cameron becomes catatonic with shock. Quite a few examples are around with over 1 million miles on the odometer.