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Generally most manufacturers claim a 0.16 km 16m per kilometre tolerance with odometer readings, however some go as far to say a 0.804km 80m per kilometre inaccuracy or more is possible. This means that over only 10,000 kilometres traveled the manufacturer of the vehicle actually expects odometer inaccuracies of up to 160km or even up to 804km! This discrepancy means that the exact odometer reading the GPS device provides will differ from the inaccurate odometer on the vehicle.
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Recalibration can be done in Fleet Servicing or in Admin, the articles explaining how are linked below.
How to update Hubo/Odometer and Hour Clock reading in Fleet Servicingreadings
How to update A Vehicle Odometer (and Hubo) in Admin
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