The flam fused location estimation is obtained after integrating sensor observations using a multisensory fusion model based on an extended Kaman filter. Apostolic et al. [[0] have recently proposed an indoor navigation system for people with VI. Their solution takes advantages of inertial sensors available in portable devices like Smart phones to provide user's location and to enable his guidance. The advantage of Dead Reckoning sensors is that they do not require pre-installed equipment and they are functional in both indoors and outdoors environments. However, without external reference, their performance is affected by many errors (bias and noise) that grow unbounded and rapidly.