Charge 3 not tracking the correct miles when biking

[Eastbourne56]

Hi

i have started to use a bike, and whilst it tracks on the map in the app, the journey I took, (about 8-9 km) it’s recorded it as just 0.18, for a 40 min cycle.

works fine when I am walking the same route.

Moderator edit: updated subject for clarity

[MarreFitbit · Accepted solution]

Hello @Eastbourne56, welcome to the Community Forums. We're sorry for the late response, due to recent events affecting our operations, we're taking longer to respond. I'll be glad to help you with your inquiry about the distance data on your Charge 3.

Fitbit devices calculate distance by multiplying your walking steps by your walking stride length and multiplying your running steps by your running stride length. We estimate your stride lengths using your height and sex. Track one or more runs using on-board or connected GPS, we evaluate that data to automatically update your running stride length. For best results, run at a comfortable pace for at least 10 minutes.

If you prefer to measure your walking and running stride lengths yourself and enter them manually, see Can I change my stride length in my Fitbit account?

Note that when you're tracking an activity with GPS, Fitbit calculates your distance using GPS data rather than steps. If you begin moving before you get a GPS signal, the tracker will calculate distance using steps and stride length as described above until a GPS signal is found.

Keep in mind that your device uses your step count to calculate distance until it finds a GPS signal. In this scenario, your total distance calculated for the workout may be slightly less accurate than if GPS data were available for the entire duration. For more information, see How accurate is GPS?

After reviewing this factors, please go for another activity and see if the distance improves. 

On the other hand, I was wondering if the mobile device you're syncing with is included in our list of supported devices? You can see the list at: Which phones and tablets can I use with my Fitbit watch or tracker?

Fitbit products are compatible with most devices that have the following operating systems: Apple iOS 12.2 and higher, Android OS 7.0 and higher, or Windows 10 v1607 or higher. Please keep in mind that when a device is not supported we cannot guarantee its functionality with the Fitbit app. It might work at a certain time and then it can stop working out of nowhere after an update. This is because the app is not optimized to that device and any change could impact the performance. 

Let me know how it goes.