> "The information fed back to Google includes barometric pressure readings so it can work out, for example, which level of a shopping mall you are on." I scoffed, but this is actually a thing: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4431287/ (It's also useful for weather observations, see the old PressureNET.io site for an opt-in version.) Anyway, my monthly mobile data usage for Google services is 110 MB and t…
Are barometric sensors commonplace in smartphones?
Even the fitbit in my pocket has a barometric sensor, to be able to count stairs.