I have read all the advice about recalibrating the compass any time you launch from somewhere different or update the P3. It is so quick and easy I don't hesitate to do it every time. I have been very careful about not doing it around anything metal or something like powerlines. Today I calibrated and set my P3 on the ground to take off. Little did I know, a bit of dew from the grass got on the camera lens and screwed up the video from that entire flight. The nicest place to lift off from is a metal picnic table, which would keep everything clean and dry. My question: once you have calibrated the compass, is there any issue taking off from a big metal picnic table? Oops, another question: I have been hand catching the P3 for landings. Is there an accepted "hand launch" technique? Seems a little more awkward controlling the remote. Thanks.