After reading and watching videos on the compass I see that some of you do the compass dance every new flight. Say that 24 hours ago you done the dance in a wide open field with nothing near and had a good flight. The next day you are going to take off from a spot near by but much closer to building concrete etc. Would you still go ahead and do the dance again or would you just keep the good calibration you got from the field the day before? If you did go ahead and recalibrate is there not a chance this could cause problems?