Hi
Yes - tracking an Outdoor Walk, for example, via the Workout app may result in a more accurate estimation of your Active Calories burned during that activity.
When you track an activity using the Workout app and specify an activity type, your watch uses the most appropriate sensors and data sources to estimate the results of that workout.
For example, when recording an Outdoor Walk:
- If you also take your iPhone along (with Location Services and Bluetooth enabled), your watch can access GPS data from the iPhone when estimating pace and distance.
- If you do not take your iPhone along, the watch relies on data from the built-in accelerometer when estimating pace and distance.
- Data from the heart rate sensor is used when estimating Active Calories, including calculations that are tailored to that specified activity type.
Calibrating your watch also helps to improve the accuracy of various estimations made by the Activity app and Workout app. More information and instructions for calibrating your watch (including for resetting any existing calibration data and starting afresh) are available via the link below. Estimations of results also depend on your personal information. To check that this is accurate - and to update it over time:
On your iPhone, in the Watch app, go to: My Watch tab > Health > Edit - tap and adjust items, then tap on Done.
More information:
Calibrating your Apple Watch for improved Workout and Activity accuracy - Apple Support
Use the Activity app on your Apple Watch - Apple Support
Use the Workout app on your Apple Watch - Apple Support