A system for tracking motion of a user includes one or more peripherals associated with the user, a first camera operable to be mounted upon the user's head, a second camera operable to capture images of the user and the first camera, a first tracking unit operable to determine the position of the one or more peripherals in images captured by the first camera, a second tracking unit operable to determine the position of the first camera and the one or more peripherals in images captured by the second camera, a location generating unit operable to identify the location of the one or more peripherals and the first camera in dependence upon the respective determinations by the first and second tracking units, a tracking validation unit operable to compare the locations of at least one peripheral as determined using the first and second tracking units and determine whether a difference in the locations exceeds a threshold value, and a location output unit operable to output location information for at least the one or more peripherals as identified by the location generating unit, where the location output unit is operable to output location information based upon information from the first tracking unit and information from the second tracking unit in varying contributions in dependence upon the difference in compared locations.