Systems, curling rocks, curling rock handles, and methods for tracking a curling rock or other play object are disclosed. The curling rock or play object has a data-collecting unit operable during movement to measure acceleration values, rotation values, time, or other parameters of the play object. A processor of the data-collecting unit wirelessly transmits one or more of these parameters, which are data indicative of player performance. Fields of play, such as a curling sheet, have devices which are activated by the play object during movement thereof. Each device upon being activated wirelessly emits an information signal indicative of at least a position of the device with respect to the field of play.
