In soccer there has been an increased focus on the overall monitoring of player workloads. To facil-itate workload monitoring the use of Global Positioning Systems (GPS) technology has become popular. It is important to appreciate how this technology works, its limitations and the validity and reliability of the derived metrics. GPS technology is currently limited in monitoring indoor training sessions, including resistance training related exercise. Nevertheless, the use of GPS, when using sufficient frequency and differential signals, and when the rationale of use is agreed and articulat-ed, can offer positive outcomes, to the better management of athletes and players. (See video, supplementary digital content, number 1, which summarises GPS use, limitations and potential in soccer).