“…It is now a wellestablished method of monitoring external training load in a range of sports (Casamichana et al, 2013;Aughey, 2010;Aughey, 2011;Brewer, Dawson, Heasman, Stewart, & Cormack, 2010;Duffield, Reid, Baker, & Spratford, 2010;Jennings, Cormack, Coutts, Boyd, & Aughey, 2012). The aforementioned recent changes to FIFA regulations have seen a growing number of studies using GPS devices to also track the demands of match play (see for example Suarez Arrones et al, 2015;Torreño et al, 2016). Despite these studies, some concerns exist surrounding the accuracy of wearable GPS technology (Rampinini et al, 2015;Bucheit et al, 2014), although it is now in widespread use in soccer clubs in the UK and around the world.…”