Apple Watch 3 (newly purchased) and iPhone XR
I rarely enable Location Services on my phone. When I go for an ‘Outdoor Walk’ the ‘Activity’ app tells me my step count and the distance covered. If Location Services are turned off how does it determine distance covered?
It seems to be using a step length of 83cm, which sounds about right, but I’ve no idea where it gets that from.
Any ideas?
Best Answer
The Apple Watch Series 3 and later comes with a built-in GPS chip. It uses a combination of GPS readings and arm movement which can be detected with the help of built-in accelerometer and give you an estimate of number of steps and distance walked.
Allowing the movement of the arm on which you are wearing the watch can lead the watch to give more accurate readings.
Apple also recommends you calibrate the watch to obtain better readings. Refer to this Apple Support document, Calibrating your Apple Watch for improved Workout and Activity accuracy to learn more.
A related discussion on Apple Community Forum post, How does apple watch count steps?, sheds some more light on what calibration does to improve the readings: