Charge 3 distance information inaccurate

[TASG]

Hello!  Every morning I take the same exact walk with my dog.  Sometimes my pace is slow, sometimes I'm able to get him to jog with me, but it varies between 15 and 20 min/mile. The distance however varies tremendously, from 2.1 miles to 2.5 miles.

How is this possible? and how do I know which it is? I am trying to also keep track of how much my dog is walking since he is a puppy and I don't want to go too far!

TIA for your replies.

Moderator Edit: Clarified subject

[AlejandraFitbit]

Welcome to the Community, @TASG.

Fitbit devices calculate distance based on the device’s accelerometer data and stride length setting.

Default stride length is based on your height and gender. If available, Fitbit devices use GPS data to calculate more precise distances.When you sync your device, our algorithm interprets the data from the device, and you see your distance traveled in the Fitbit app. 

Note that when you track an exercise with GPS, both GPS and accelerometer data are used to calculate the distance shown in the Fitbit app. For more information about accuracy, check the article: How accurate are Fitbit devices?.

Let me know how it goes.