Holy cow- that was scary

Discussion in 'Mavic Pro Discussions' started by Hayabusa, Jan 12, 2018.

  1. Hayabusa

    Hayabusa Active Member

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    just picked it up from Shop-they replaced camera- (in other post)
    I took it up to test out and it was a little cloudy and windy but had plenty gps. All was fine until I took up to about 300’ and was flying around when all of a sudden I got a calibrate compass signal and all of a sudden she just started to fly away. I was panicking too much to look and check anything. I finally got some control but was not locked on satellites. So I think it wasn’t flying away but being blown away. As soon as I would let sticks go it would drift in same direction quickly. I then brought it down and regained everything and landed that sucker.
    I’m not exactly sure what happened but Is it possible that with all the clouds I lost all satellites and the reason that it drifted? As i said, I panicked and didn’t read any of the displays. Was concentrating on visual.
    Not sure about compass!
    On my old P3s- I could go right into the settings and always calibrate (needed or not) and I always did. Am I blind, but I don’t see that option. I tried before the flight but it said normal and I didn’t see an option for doing it anyways. (I know, read the manual)
    I honestly thought my brand new Mavic plus the extra $400.00 in a new camera was just going to keep flying away. It got about 300’ away before I was able to get control. Scary!
    Anyway to check a flight record to see if it gives me a better story and some insight of what went wrong or better said, what I did wrong?
    Thanks
    Mike
     
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  2. 53-63-6f-74-74

    53-63-6f-74-74 Well-Known Member

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    You'll have to upload a flight log for anyone to help determine what went wrong. If you just had a repair done you should calibrate the compass as well as the IMU before flight.
     
  3. MavicCF

    MavicCF Well-Known Member

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    If you go back and watch your log from the flight, you might be able to see if and when your GPS dropped and it went into ATTI mode. Probably you could get someone to look at your flight logs too to verify what happened. Hope it won’t be a reoccurring problem and keep you out of the skies. -CF
     
  4. Hayabusa

    Hayabusa Active Member

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    How do download flight logs? I’m am not a tech person.

    I will look at calibrateing the Imu as well.

    Mike
     
  5. BD0G

    BD0G Well-Known Member

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    The DAT flight logs are stored internally on your Mavic. The TXT flight logs are stored on the mobile device running DJI GO. You can find tools to retrieve/read those flight logs here.

    How to retreive a .DAT File
    How to retrieve a V3 .DAT File from the AC
     
  6. Hayabusa

    Hayabusa Active Member

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    Thank you!
     
  7. MarkNix

    MarkNix Well-Known Member

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    All I can offer is that positively, for sure, clouds did not affect the GPS signal.
     
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  8. borislip

    borislip Well-Known Member

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    Somehow this reminds me a GPS loss that happened to me about half a year ago or so. Gladly, despite being out of VLOS at that moment, the video reception was good, flying back in ATTI, navigating by video, was a non-issue. Unlike in this case, though, i did NOT regain the GPS until the bird has been rebooted. I think i've got a textual GPS error message of some kind before it went ATTI, but all i've got on the logs is a GPS reception loss, no descriptive errors. This has never happened again, and i've never found out what went wrong
     
  9. GerdS

    GerdS Well-Known Member

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    I have heared that in case of compass errors and falling into Atti mode you can do an emergency calibration by just rotating the Mavic several turns around its yaw axis. After landing you will need to do a full compass calibration. Never tried by myself as I never had that problem.
     
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  10. Hayabusa

    Hayabusa Active Member

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    All I know is that it was moving away when sticks were released. Something was wrong and downright scary.
     
  11. Hayabusa

    Hayabusa Active Member

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    I’ve been thinking about it all night. I need to retrieve the flight log. I want to know what happened, how to react if it ever happens again and more importantly, how to prevent.

    I calibrated the imu and compass.
    I figured out how you have to go into the settings and sensors to calibrate these, unlike on the P3s, it was right there.

    I’m still not confident until I see exactly what went wrong or what I did wrong.
    I want to find a video tutorial on a how to fir the flight log.

    Thank you
    Mike
     
  12. Hayabusa

    Hayabusa Active Member

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    Do I need to download from both A/C and remote or just A/C?
     
  13. BudWalker

    BudWalker Well-Known Member

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    The .DAT from the AC is best, but can sometimes be difficult to get. If you have trouble with this then the .DAT from the tablet can sometimes yield useful info. Look here
    How to retrieve a V3 .DAT File from the AC and
    How to retrieve a V3.DAT from the tablet

    You can also retrieve the .txt from the tablet which may help some. To see how to do this look here
    DJI Flight Log Viewer


    The .DAT from the remote can't be used.
     
  14. Hayabusa

    Hayabusa Active Member

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    I found the file on the tab. At the point that it started drifting or “flying away”. On the logbor map it shows the ac just sitting. Then after a while, all of a sudden the ac shows up in the area where I then regained control.
    I’m downloading the assistant now. Hopefully i or someone can shed some light on this so I don’t freak every time I fly.
    Mike
     
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  15. Hayabusa

    Hayabusa Active Member

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    I tried with assistant 2. The tutorial said to go into main settings/ac/advanced/data files at bottom. But do not see data files anywhere.
    I also logged into dji assistant 2 but do not see ac.
    I hate tech stuff.lol
     
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  16. zero1981

    zero1981 Active Member

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  17. Cymruflyer

    Cymruflyer Active Member

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    GPS is not affect by clouds what so ever. I've been flying with GPS since almost its inception with my aircraft both in the UK and the USA and in the UK 80% of flying was under clouds. We know in aviation that a GPS is not affected by cloud cover in the slightest, therefore the same holds true for any Drone with GPS. What can happen is that something affects the signal, something that might be in that area, such as other radio interference, or strong Microwave signals, something that you may not be aware of.

    I recall a number of years ago when flying WNW out of Memphis TN I would fly through an area whereby my engine and flight instruments on the glass cockpit flight display would go crazy, yet the engine sounded fine and the aircraft would fly perfectly normal, then about a minute or two later all went back to normal. Who knows what was being beamed through the area at that point, but something extremely strong was and always affected my instruments every time I transitioned through that area.

    If clouds bothered a GPS, every time it was cloudy your car GPS would not work, nor any Aircraft GPS. I have no idea what caused your problem but what ever it was, it was not and never will be cloud cover, so you can put that worry to rest. I'm looking forward to hearing what caused your problem, lets hope you find out soon.
     
  18. colinfowler

    colinfowler Well-Known Member

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    If it starts drifting away due to wind, switch to sport, lower altitude if safe and you will get back manually
     
  19. Hayabusa

    Hayabusa Active Member

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    I celebrated both IMU and compass. Just took her out for a quick test. Everything seemed fine.
    Btw. The area I was flying in is at my home and flown the most time there.
    Something went wrong. I’m still going to try and download log to see.
    For now, my confidence is up a little bit again.
    Mike
     
  20. colinfowler

    colinfowler Well-Known Member

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    Nice one Thumbswayup
     
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