Why didn Polar use GPS technology for SD for the S625X Running Computer?
We considered both GPS and inertial technologies carefully before choosing to go with inertial technologies. GPS has some positive elements but we chose the best overall technology for running anywhere and in any conditions. We recognized that existing GPS was too heavy and consumed too much power for an application that was meant for runners who are demanding and relatively heavy users and train frequently. Existing GPS applications are simply not as practical for someone who is running frequently because of the need to constantly recharge/replace batteries and because of the discomfort of hauling abound a large GPS unit on the upper body. When used in a real life running scenario- GPS is no more accurate that inertial sensor technology. With inertial technology we saw that we could provide the best solution for runners who want accurate and reliable speed and distance measurement that performs in all conditions (indoors and outside), in urban city settings with tall buildings, even i
