November 20, 2012 
As I mentioned, I got my new FitBit One the other day. I’ve been experimenting with it each day. Yesterday, I showed how it performed versus a pedometer. Today, I focused on how it performed versus my Garmin Forerunner watch that I use to track my distance and speed when running outside. While the data relative to the pedometer was pretty similar, there was a 15-16% discrepancy between the FitBit and my Garmin.
According to the Garmin, the FitBit was underestimating my distance traveled. To validate the distance, I also used www.walkjogrun.net to calculate the distance (which they estimated to be 0.82 miles).
At the same time, I also wanted to see if there was a difference between just having it sitting in the bottom of my pocket versus putting it on my belt loop. Location didn’t seem to matter.
(Note: This chart shows distance in miles.)
Enabling Healthy Decisions 
The fitbit is just trying to get you to burn more calories 🙂