ABSTRACT
Global Navigation Satellite Systems (GNSS) are the most widely used tracking technology for sports monitoring in outdoor conditions. Knowledge of the different aspects that can influence the measurement through GNSS is essential to obtain the best signal quality during monitorization. To do this, the different mathematical calculations and their interpretations are described to assess the reliability and validity of the measurement using GNSS, as well as showing previously published studies and the results obtained in independent analyzes carried out by FIFA. Finally, the different electronic performance and tracking systems (EPTS) with GNSS technology, their different components for the monitoring of internal and external load and some final conclusions from the contributions of this chapter are identified.
