GPS isn't recording accurate mileage on runs?

[Windows Central Question]

Does anyone else's band record a lower mileage on runs than what you are actually doing? Just switiching over to my band for runs after using my fitbit for a long time. I did a 1.5 mile run this morning and my band says it was only 1.36 miles. But this is a route I know for a fact is 1.5 miles.

Any fixes? Should I bring it in, I have complete.

 

[Jakoh]

how you figure its 1.5miles? due to fitbit?
Whats the sample size of this run on the band? and the variation?