Why do different apps running simultaneously give varying GPS distances?

[lhajm95]

I use Jabra Sport, and Fitbit when I run. They rarely, if ever produce the same distance even though I start them at the same time. Example, on a recent run, Jabra measured it at 4.04 miles, Fitbit at 3.89. How do I get these in sync?

 

[ManiacJoe]

Most likely, the only thing you can do is to set the GPS on the device to high accuracy.

After that, you have no control over how the calculations are done nor on how often the GPS data is sampled.