Since Xmas there seems to have been a serious outbreak of dodgy data on Wundermap, at least in this part of the world (Scotland). This appears to be largely down to stand alone Netatmo temperature units. Santa must have got a cheap bulk purchase of these items, and they obviously come straight out of the box already transmitting data. Anyone getting a mysterious metal cylinder in their Xmas stocking and then losing the instructions might be wondering what it actually does.