Friend and I are hikers, she's wearing a Vivoactive 3 and I have the 935. Last weekend we did a 6.5 mile hike together. my 935 counted me doing a little over 8000 steps and 25 floors. Her's was over 12,000 and 150 floors. It was well over 1500' of elevation gain up the side of a mountain. This isn't the first time my 935 hasn't counted the elevation or steps. We are both using the standard Garmin hiking app.