GPS shows different distance between trackers

[SunsetRunner]

I own a charge 2, my wife a charge 3. on walks around 2 miles, her gps records about 1/2 mile longer than mine. we are both 5'7" and have recorded the number of steps taken and they are alomst exactly the same. The picture shows the exact same path on both devices. I know that they will have slight differences, but is 25% normal? 

Moderator edit: updated subject for clarity

[AlvaroFitbit]

@SunsetRunner It's nice to have you on board! Sorry for the delay in my reply.

Let me help you with your GPS data discrepancy. Not sure why this may be happening but lets try refreshing the link between your phone's and your tracker to help increase the GPS accuracy by doing the following:

1. Go to your phone's bluetooth settings and remove all devices listed there.
2. Restart your phone and restart your device. 
3. Check that no battery saving app/feature on your phone is affecting your Fitbit app.
4. Also, on an Android device, check that your app has the necessary permissions (settings > apps > Fitbit > permissions) and make sure bluetooth and location services (GPS) are on. 
5. You can find troubleshooting instructions here.

Note that your device uses the number of steps and stride length to calculate the distance. You can improve the accuracy by measuring and logging your stride length. Feel free to use these instructions to do this.

Let me know how it goes.