During the past decade substantial development of computer aided tracking technology has occurred. Therefore, it was aimed to provide calibration equations to allow the interchangeability of different tracking technologies used in soccer. Eighty two highly trained soccer players (U14-U17) were monitored during training and one game. Player activity was collected simultaneously with a semi automatic multiple camera (Prozone), local position measurement (LPM) technology (Inmotio) and two global positioning systems (GPSports and VX). Data were analyzed with respect to three different field dimensions (small, <30m to full pitch, match). Variables provided by the systems were compared, and calibration equations (linear regression models) between each system were calculated for each field dimension. Most metrics differed between the four systems with the magnitude of the differences dependent on both pitch size and the variable of interest. Trivial to small between system differences in total distance were noted. However, high intensity running distance (>14.4km/h) was slightly to moderately greater when tracked with Prozone, and accelerations, small to very largely greater with LPM. For most of the equations, the typical error of the estimate was of a moderate magnitude. Interchangeability of the different tracking systems is possible with the provided equations, but care is required given their moderate typical err
or of the estimate
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