Inaccurate KM on Ionic

[Visakort]

Hello!

I have a Ionic, and my wife a Versa. We run togehter, but on a 10km run we arreound 1km different in distance. When running Amsterdam Marathon two weeks ago, my Ionic showed 44,23 km, not the 42 km. Another friend with same watch tracked almost on the meter the same marathon.

What cause this error, and can it be adjusted? 

Moderator edit: Updated subject for clarity 

[SilviaFitbit]

@Visakort Welcome to the Community. Thanks for the details mentioned. 

Congratulations on running the Amsterdam Marathon. I'll be happy to help you clarifying your question. 

All devices with GPS sensors require a direct path to GPS satellites to calculate location. A weak GPS signal might affect the accuracy of your route and other activity data. Your device uses your step count to calculate distance until it finds a signal, so the total distance calculated for a workout may be slightly less accurate when GPS isn't available for the entire time. 

You may want to try these tips to improve your distance accuracy: 

• Your wrist settings (For more information, see Does the wrist I wear my device on affect accuracy?)
• Your height (For more information, see How do I manage my Fitbit profile?)

Since we use height to estimate your walking and running stride lengths, you may want to measure and manually adjust these values if your legs are longer or shorter than average. For more information, see How do I measure and adjust stride length for my Fitbit device?

Sometimes, when you start walking, your steps may not update on your device right away. After about 10-15 continuous steps, you'll notice the steps catch up and start updating in real time with each step you take.

I'll be around if you need further assistance.