Welcome to our community @LadyLuli. Your tracker calculates distance by multiplying your walking steps and walking stride length. Similarly, your running steps are multiplied by your running stride length. This will not necessarily match a pre-measured distance or what a GPS will told you. Now this this change when you are using the GPS on your Surge for certain activities, as this will user the feature of GPS to give you distance and pace along with your course map when you synced.
Hope this information helps and I wish you the best.
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