So far, for my first two or so flights, I have calibrated the compass each time. I haven't calibrated the IMU since the quad was unboxed this morning. I had a slightly hard landing in the grass on one of my flights , but no damage at all. I was wondering if it is recommended to do a IMU calibration after that landing. I understand that you should calibrate the compass when visiting new flight areas, but how far do they need to be apart? Should I do it when flying on fields in different towns? States? My worry is that I have heard that calibrating the compass too much will lead to a bad calibration. Thanks!