I thought this problem had gone away with the older Fitbit devices, but it appear to not be the case.
My wife and I were driving back from Norfolk today and I noticed something strange happening. When we left I only had 550 steps according to the Epix, but then I noticed a big change, an extra 441 steps.
I kept an eye on things and the following happened-
In the space of 42 minutes the Epix added 154 steps and so I ended up doing almost 500 steps without moving during the 2.5 hour journey, and I wasn’t even driving.
It is hard to understand how an £800 fitness watch cannot fix this- the GPS alone shows that I am travelling at 70 miles per hour, I am obviously not running, and so I would expect software to be able to solve this.
This has been going on for some time (see this Reddit thread from a year ago) and so I suspect that Garmin cannot fix the problem easily.
It may not be a big deal for many people, but what it does do is knock confidence in an expensive system. It should not be happening and I should not have to turn off activity tracking on the Epix every time I drive because the product is not clever enough to work this out.