I have thoroughly enjoyed this. I have been testing this idea for around 10 years or so. Ian kind of a jack of all trades, only thing I dont do is sports. I am also a developer. I have been attempting to build an arduino based sensor array that uses mesh networking to communicate with other hubs. The express purpose being to gather magneto field data of localized areas.*¹³⁵⁶⁸ I especially want to prove your assumptions because I live in Arkansas less than 20 miles from the recent EF4. The thing was less than 1000 yards from my girlfriends home.