DISTANCE METER

摘要

The invention relates to a method (800), a sytem (100) and a device (102) for measuring the number of laps and/or the distance covered by a person during his/her performance. The invention relates particularly to a distance meter (102) to be worn by the user, which measures the distance covered by the object and comprises a magnetic sensor (212) for determining the direction of a magnetic field (304) external to the sensor relative to the sensor (212). The distance meter (102) to be worn by the user in accordance with the invention also comprises a counter (207), whose value is increased when the measured deviation of the magnetic field exceeds a preset limit, i.e. in the situation where a fitness trainer following a given track turns and starts moving into another direction on the track.