I see a lot of people having compass errors with the P4.....maybe even the P3s. Some will suggest to stay away from all ferrous metal. Some even suggest to remove all metal from their person. .....watches, belt buckles, keys, etc. Is this really necessary.? I have P1s and I always wear a watch, have keys in pocket with pocket knife and a 9mm on my side. I never have a compass problem. Are the compasses on later Phantoms more sensitive to this?