If you start a heart rate measurement operation while already engaged in exercise, it may take some time before the displayed value approaches your actual heart rate. Note that immediately after the start of heart rate measurement with the Heart Rate watch face Auto Measurement setting, the measured value may not match your actual heart rate. To obtain more accurate heart rate measurement, the following steps are recommended.
1. Affix the watch to your wrist before starting your exercise.
2. Perform the operation to start heart rate measurement and remain still for about 15 seconds.
3. Start your exercise.
