I have just started using FitBit. I am not much of a runner but I do kayak a lot. I was just curious whether anyone has experience using it while paddling and whether it clock each paddle stroke as a step.
Based on the FitBit website, it appears that the device goes to great lengths to solely detect steps, rather than other motion:
They website makes mention of a 3-axis accelerometer used for detection - this tool, in conjunction with the "finely tuned algorithm", make it unlikely that kayaking will register as steps, especially where the kayaking motion is "smaller" than most steps. It appears that this is the case, as vidstige documented in his answer.
If you're looking to have the kayaking register, a normal pedometer, with a 1-axis accelerometer, would likely work better, as it will log most motion rather than calculating whether that motion was a step.
I just got back from a 10k kayak session, but my Fitbit logged is as ~5k. It was in a calm lake with hardly any wind any obviously no water streams. I had the Fitbit on my non-dominant hand as per usual.
I don't know how they log it exactly, but it does not seem to have any explicit kayaking support.