I am so happy I've found this site and have been reading everything I can. Took the I1 down to a stadium yesterday to be used as a reference for an air powered rocket launch( to give people a ref for altitude of rocket.) anyway setup in the car park about 30m from the large metal stadium to do my compass cal. Did that got a reading of around 1500. Took off before people came out to watch and oh my god it went crazy. Recognized the TBE so switched straight into atti and managed to fight it back into land dodging lamp posts and fences. So happy I've read everyone's advice on what to do. Anyway took it to the far end of the car park and the compass mods were 1200. Did another compass cal and everything was fine. So took off from there for the 2 flights.