The box on the back of rugby players shirts is a GPS tracking device that provides detailed performance data. The device is inserted into a specially made pocket on the back of the shirt or carried in a harness worn under the shirt. The GPS tracker measures a variety of statistics about every player, including distance covered, speeds reached, and overall heart rate of players. The data provided by the GPS tracker can help coaches and analysts gather information on how much ground a player has covered, at what speeds, and when a players intensity starts to drop. The device is used to manage a players workload to make sure that they stay healthy and able to perform at their peak for the entire season.