Google this query.
do smartphones use acceleromter to improve gps speed accuracy
Accelerometers can help smooth/estimate motion between GPS updates, but they do not reliably improve true speed accuracy for sports timing on their own.
Why not?
An accelerometer measures all acceleration forces, including:
- actual forward/backward acceleration
- tilt/rotation of the phone
- vibration/chop/water impacts
- rider/body movement
- gravity (unless perfectly compensated)
That makes it very noisy for something like eFoiling/kiteboarding.
I do not think its generally unreliable for GPS speed.
If you take a longer track and measure the speed over a longer period, its pretty good.
Phone in car will also have a pretty strong smoothing on the data.
The issue is just max speed, where only one or a few data points are used.
This can vary a lot and your max speed will then be simply one, where the errors results in the highest speed.
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Also when it comes to 65220 motors, guys be extremely careful when it comes to the wires.
They are using a silicone that is extremely prone to fatigue, I just noticed on a sample that i cut that i have a few cracks after a few extreme bending tests. On my setup efoil i managed to do sort of a stress-relief mechanism but Iām noticing this wont be enough if someone pulls the wires too much or they get trapped and squeezed.