So I did another run with the watch straight on my wrist, and the Polar H10 connected. I connected the H10 also to the Polar Beat app. HR data of both Suunto and Polar Beat we’re basically the same, so it’s safe to say that Suunto was actually showing me the HR of the H10. During the run I also put the watch over my jacket, and this is where I started to lose connection again. But while being worn straight on my wrist, there is no problem.