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he aim of the paper is to compare two methods of motion data acquisition using: (1) a mobile device, and (2) an optical reference system. The paper presents a mobile application developed by the authors for the Android platform which was used for motion registration process. The application reads the data from the embedded accelerometer and magnetometer sensors in three dimensions (along X, Y and Z axis). The application performance was evaluated with the help of a passive motion capture system, which was used as a reference. The presented analysis indicates how precise the mobile registration method is in relation to the reference system. Distance and speed are the parameters that were taken into the consideration. Motion was registered by a mobile device attached to the participant’s arm. Retroreflective markers, required by the reference system were attached to the phone and mounting bands. The participant performed the following activities: walking and running. The results obtained using mobile devices were not precise and have been found to strongly depend on the mobile device used. They may be useful for gathering coarse motion statistic.