Calibration

Calibration means setting your odometer so it measures the same distances as the organiser. The result is a calibration factor that your device uses to correct what it measures.

Why you calibrate

The organiser measured the route with their own car. Your car measures slightly differently because of other tyres, tyre pressure or driving style. Even a small difference adds up to several seconds of time deviation over a test.

How to do it

1. Drive the organiser's calibration route and note what your trip meter shows.
2. Divide the official length by your reading.
3. Multiply your current factor by that result.

Example: the calibration route is 10.00 km long and your trip meter shows 10.15 km. 10.00 divided by 10.15 gives 0.985. Your trip meter reads 1.5 percent too much and is corrected by that factor.

Tips

• Drive the calibration route the way you will drive the tests, with normal tyre pressure and the full crew on board.
• If you can, drive it twice and compare.
• Check the factor during the rally at clear landmarks in the roadbook.

Find a step by step guide in our guide to calibrating the odometer.