Besides, the conducted experiments are restricted in corridors with a system carried on a cart, which provides a much more stable video capture than that acquire with a Smartphone in walking conditions. In [20], two vision algorithms are combined with dual multisensory MEMS-IMU units (torso/foot): a vision based attitude aiding by detecting a central vanishing point, and a vision-based position aiding by recognizing previously visited location (path loop). Nevertheless the central vanishing point is used every time it has been recognized close to the expected positions in image, its detection is also constricted in corridors.