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Speed and distance measurements are core parameters for your exercise targets and fitness level estimation. When not using connected GPS with the Suunto app, your Suunto 3 Fitness utilizes an accelerometer, a motion-sensor which detects movement from your wrist, to measure speed and distance. As wrist movement and the related stride length vary from person to person, the sensor needs to be calibrated to your own personal movement.
Note: In an uncalibrated state, your watch cannot measure speed and distance accurately without connected GPS.
Because your stride length is different between running and walking, you need to calibrate for both activities. You can do that in two ways:
1. Connected GPS
With connected GPS, the calibration of the wrist-based speed and distance measurement is done automatically once you connected your watch with Suunto app and started an exercise. Learn more in the user guide for your product.
2. Manual calibration
With manual calibration, you need to run and walk known distances, and then adjust the distance in your watch after you have stopped the exercise recording.
Note: In general, the way you move your wrist during a running or walking exercise may affect the accuracy of the speed and distance measurement.
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