I have a P3S, I was told that I don't have to calibrate the compass, if I'm flying in the same location day after day. Today, flew in the same location as I have a few days ago. I didn't do the calibration dance before taking off. I noticed a difference in staying steady in a hover. It didn't seem to stay locked on. Home point was updated, but drifted more then usual with 9 mph wind. So my question is do I calibrate compass before every flight?