Re: blind man running
This is what Polar says about their sensor, so it seems pretty advanced:
Q: GPS technology is considered advanced by many. What about the Polar inertial sensor technology that Polar uses?
• The inertial technology that Polar uses is very advanced, inertial technology is used in aerospace positioning and guidance systems, industrial robotics and in advanced automotive applications such as active suspensions and emergency airbag deployment to name a few
• The inertial sensors measure the acceleration of the S1 foot pod more than 1000 times per second and use this data with advanced algorithms to calculate foot angles and gait velocity
• The Polar S1 running speed and distance sensor is NOT A PEDOMETER. Instead, it is very advanced running speed sensor.