Correction factor
The factor from the odometer check used to convert the rallymaster's distances to the crew's own odometer – calculated as 'official distance divided by your own'.
The correction factor is the result of the odometer check in American TSD rallying. It is calculated as 'official distance divided by your own measured distance' ('theirs over ours'). With it the navigator converts all the distances given in the route instructions to the crew's own odometer reading, so that controls and due times are hit precisely despite measuring tolerances. A factor above 1 means the crew's odometer under-reads; a factor below 1 the opposite.
Glossary from A to Z
Related terms
Distance
Precisely measured length of a route section – the basis for calculating target times and average speeds.
Odometer
The distance counter built into every vehicle and the simplest form of distance recorder. Usually too imprecise for rally navigation – the more accurate tripmeter is used for that.
Odometer check
A short, measured section at the start of a TSD rally where the crew compares its odometer with the official distance (also odometer calibration run, OCR).