The pad on the back of a rugby shirt is a GPS tracker or GPS pod that measures a host of physical data emitted by the player. The GPS tracker provides detailed performance data such as distance covered, speeds reached, and overall heart rate of players. It is designed and positioned to sustain collisions and scrums. The GPS tracker is kept in place in between the shoulder blades in something called a "Bro" which works in much the same way as a female athletes sports bra. The padded casing surrounds the GPS tracker, which is commonly referred to as a GPS tracker, although it contains other measuring devices. The visible part of the GPS tracker is the packaging designed to protect both the electronics and the player from damage due to the usual impacts in rugby.