Well, I'm not sure that a drone network would be better - it's just a hunch. We have so much growth left inside the smartphone world that our focus is exclusive

Well, I'm not sure that a drone network would be better - it's just a hunch. We have so much growth left inside the smartphone world that our focus is exclusively on smartphone sensor acquisition right now (through our SDK platform approach). Stationary sensors are in our horizons too, definitely. In terms of sensor accuracy: luckily, one of the most valuable metrics we're watching is actually pressure tendency over time and not necessarily absolute pressure values. This means that even offsets of 2-3mbar are okay as long as the trends are visible (which they are). Absolute pressure is valuable too, so we're developing some techniques to deal with corrections for altitude noise as well as manufacturer bias - none of this is live yet, though.