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Javelin is a throwing game in track and field games with little danger, especially for the referee and measuring staff. It occasionally happens that they are hurt by the javelin in certain angle and direction. At the same time, it is trouble to measure the throwing distance, which requires precise measuring and computing. The E-Javelin is prompted to solve these problems. It is designed to work with digital locating and sensing technique. The embedded electronic system may locate the starting point and landing point precisely, and compute the distance between them exactly. It is safe for competition, and convenient for providing the result.