rjsqxxx wrote:
I think tried leaving feedback in the past. Here is another aspect of the problem that seems consistent. Even after rebooting the watch, it’s doing a poor job tracking my distance. My treadmill will record nearly 2 miles but the watch will record 1.30 miles. That is a significant difference. It’s almost like the pedometer does not work right.
There are different types of indoor walks. If I told you to measure the distance someone goes on a treadmill with just a sensor on their wrist, how would you go about accomplishing that. It is exceptionally difficult. How can a watch on someone's wrist determine how far a treadmill has gone. The answer: it measures your arm moving back and forth with an accelerometer as you "stride" and tries to (a) determine how many strides you took, and (b) determines the "distance" by trying to determine how far each stride represents based on your height and weight. Item (a) is often wrong because different people move their arms differently when they walk or jog so the watch has to use some sort of mean value calculation; item (b) is also imprecise because the stride calculated from height and weight can vary for different people and body types. Also, the accelerometers have biases and drifts which cause some level of errors, this is just an engineering reality. It is commonly reported online that watch type sensors (of all makes and manufacturers) underestimate indoor walks because some walkers move their arms differently or even don't move them as much on treadmills as in natural walking.
It is one thing to complain about the indoor walk or treadmill distance being not as precise as one would like, but it seems to me that it is a real stretch to expect a watch on one's wrist to determine how far one goes on a treadmill very precisely. Perhaps there are ways to calibrate one's stride and input that into the watch settings (see link below), I don't know as I use mine only for outdoor workouts. GPS is almost always available for outdoors activities and mine get recorded quite accurately (compared to what, say, my phone records or what I have measured on the route independently), but GPS might be detectable for some indoor walks, e.g. on a track (to GPS, a person on a treadmill is stationary and doesn't go anywhere, so GPS can't be used for treadmills).
Apple does offer a method to calibrate the distances so it can better determine indoor distance from what it can measure: Calibrate your Apple Watch for improved Workout and Activity accuracy - Apple Support