Validity and reliability of GPS devices for measuring movement demands of team sports.

By Aaron J. Coutts, R. Duffield. Journal of Science and Medicine in Sport, 2010

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Reliability and Accuracy of 10 Hz GPS Devices for Short-Distance Exercise. (2011, background): “…10, 233-234 http://www.jssm.org Reliability and accuracy of 10 Hz GPS devices for short-distance exercise Dear Editor-in-Chief The use of GPS technology for training and research purposes requires a study of the reliability, validity and accuracy of the data generated (Petersen et al., 2009).”
Influence of technical instructions on the physiological and physical demands of small-sided soccer games (2011, methodology): “This method presented a coefficient of variation of 3.6% for total distance covered and 5.8% for sprinting (Coutts & Duffield, 2010).”
Effects of manipulations of player numbers vs. field dimensions on inter-individual coordination during small-sided games in youth football (2015, positive): “The reliability of similar type of devices has been well documented in the literature (Coutts and Duffield, 2010; Johnston et al. , 2013).”
The Validity and Reliability of Global Positioning Systems in Team Sport: A Brief Review. (2016, methodology): “Similarly, Coutts and Duffield (8) have reviewed the interunit reliability of distance measures, although their results were mixed.”
Validity and reliability of GPS for measuring instantaneous velocity during acceleration, deceleration, and constant motion (2012, neutral): “Keywords: Instantaneous velocity, accuracy, motion analysis”