Commercial smart wearables are becoming more popular and more fashionable. Consequently, their
utilization in real-world applications such as navigation is of great importance for end users. Though the built-in sensors are currently used for lifestyle and fitness applications, we see a possibility for their deployment in navigation applications. For navigation of pedestrians based on inertial sensors there exist
two common approaches for mechanizing inertial data namely: the pedestrian dead reckoning (PDR) and the strapdown inertial navigation system (INS) mechanization. Each method has its own advantages and disadvantages. By combining both approaches in a proper way, we utilize their advantages. To do
so, we need to have sensors that are fitted for use in each scenario. The wearables can provide a promising solution for strapdown INS mechanization by benefiting from the zero velocity update (ZUPT) moments. Their ultra-small size allows embedding them in foot or ankle where the ZUPT is applicable. Experimental results show that a relative position error of about 5% for every 1 minute of walk can be obtained using our method for the automotive grade sensors.