I know this is a lot of stuff but list the number with any response please. / I've flown nearly 100 flights with my two phantom 2's, had a crash lately and ordered a third, now I'm looking to really enhance my safety education. I had a radio interference related crash, or so I believe, so I think knowledge about such things is the best prevention. I've developed a list of concerns that I am not totally sure of, so give them a try, or you may have the same question! Thanks!! 1. If I am to calibrate in a construction site and there may be metal structures, vehicles, or other objects around the target. How far should you be during calibration? I know metal objections, particularly the possibility of you standing on reinforced concrete, and other such things, are not be close during calibration. 2. If I temporarily lose connection to 6+ satellites and GPS mode during flight, what happens? ATTI kicks in? 3. If I am to experiment with switching to ATTI / MAN during a GPS flight, what am I expected to experience? Altitude hold and position hold (with no wind) in ATTI mode, yet less position and altitude holds in MAN mode? I have flown ATTI inside but just briefly and not for long enough to be comfortable. 4. What if many quads with 5.8Ghz fpv and 2.4Ghz signals all stay connected between the proper video receivers and monitors, and UAVs to the proper RC transmitters? I understand receiver antenna redundancy and spread spectrum technology in an RC transmitter, but I still find there could be issues? No? What about at these UAV and RC events where there many be 10+ UAVs flying at once in a single area? 5. IOC mode seems awesome and I totally see the benefits in certain situations. Maybe nearly all situations? I am note sure. I'm pretty comfortable flying regular flight mode in GPS, but consider how IOC may be a great alternative. What are the expert thoughts on this. Stick to normal or master IOC too? 6. I need to get a radio frequency anayzer. Does someone have a suggestion on a product or experience with such devices? 7. I am particularly concerned with marine environments. I am beginning to research boat radio bands and at which radio harmonics this could be a concern. I hear about many flyaways and radio issues over shipyards and marinas. 8. Lots of people have been talking about magnetic storms and the Kp index lately. I have the app which alerta you at 4 or higher. I have flown in 4s. Is there a real Kp index measurement where a concern is present? Have people heard about true issues with UAV flyaways and GPS struggling during a magnetic storm and paired high Kp? 9 I understand that power lines give off an electromagnetic field. People advise to steer clear of these, however I have seen lots of videos of people flying very very close. Thoughts? I cannot imagine all these power lines are inactive. This is a good start. Cheers! Thank you so much for contributing!