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( Odometer)
An odometer (often known colloquially as a mileometer or milometer) is a device used for indicating distance traveled by an automobile or other vehicle. It may be electronic or mechanical. The word derives from the Greek words hodós, meaning 'path' or 'way', and métron, 'measure' (an older name for this device is hodometer). Recently, exercise enthusiasts have observed that an advanced Global Positioning Satellite (GPS) receiver (GPSr) with an odometer mode serves as a very accurate pedometer for outdoor activities. While not truly counting steps (no pendulum is involved) an advanced GPSr odometer can reveal the accurate distance traveled to within 1/100th of a mile (depending on the model, perhaps 1/1000th of a mile). 1/1000th of a mile is approximately the distance of a single pace or 2 steps. The modern definition of the international mile traces back to the Roman military method of keeping track of how far a soldier had traveled on foot. The Latin "mille passus" is literally "a thousand paces" where 1 pace = 2 steps. The international mile (5,280 feet) is somewhat longer than the original Roman mile (4,854 feet). As with the mile, the definition of "foot" has changed many times. A GPSr with odometer mode is also an excellent and inexpensive means to verify proper operation of both the speedometer and odometer mounted in a vehicle.
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