Mavic flyaway covered by warranty

Discussion in 'Mavic Pro Discussions' started by deckdog, Nov 30, 2016.

  1. deckdog

    deckdog Member

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    Hey guys, thought you would be interested to know that DJI is covering the repairs to my Mavic Pro. Short version, launched at dusk. All systems were go, sent up about 50 feet to see if I could lock onto a few more satellites. Not touching the sticks, suddenly got message the satellite positioning was off. Within seconds, Mavic was heading off on its own. Luckily there was a big tree nearby and it went right through the branches, busting up the props and it came crashing down. If not for the tree, I might still be looking for it. DJI's response was "warranty per flight data analysis". Happy to be getting it fixed under warranty, but still hoping to get answers as to the reason for the flyaway.


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  2. duelingglove

    duelingglove Well-Known Member

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    So sorry to hear that, at least you get it back. This is great to at least hear about Dji. As I wait patiently. On my bird


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  3. Petomaster

    Petomaster Member

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    Was that under normal warranty or was it because you purchase the DJI refresh?
     
  4. deckdog

    deckdog Member

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    Regular warranty @Petomaster. I did not purchase any additional coverage. Hoping to get some answers about what happened, but want to get my bird back before I start asking too many questions.


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  5. Petomaster

    Petomaster Member

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    hey... that's good news for you. Did you have to supply logs from the flight?
    Or did they just ask you to send it back for repair?
     
  6. deckdog

    deckdog Member

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    I just sent them an email explaining what happened. They asked to send it back to them for evaluation. They paid for the shipping also.


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  7. BriRi

    BriRi Member

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    I hope I am wrong, but I believe when DJI says "warranty per flight data analysis" that means they will download info from the Mavic when they receive it and determine IF it will be covered under warranty. There is still the chance that they could deny warranty coverage.

    Hopefully everything works out and it is fully covered. Please keep us posted on the progress of your claim.
     
  8. J3ffrey

    J3ffrey Active Member

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    Yeah I was going to say...I don't see them saying they will cover it at all. Horizon Hobby did the same to me... "send it in, we'll take a look at it"

    No coverage.
     
  9. deckdog

    deckdog Member

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    You are both correct BriRi and J3ffrey, I did not know if they would cover the repair until they had the drone for a few days. That's when I got the note that they would repair under warranty. Still don't know why it flew off. Hoping they provide some answers.


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  10. Bryan Conover

    Bryan Conover Member

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    Dual GPS receivers and it's still getting I'll reception. No ability to shift in to ATTI mode. Shame on DJI if they considered denying your request.
     
  11. msinger

    msinger Well-Known Member
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    The Mavic does not have dual GPS receivers.
     
  12. deckdog

    deckdog Member

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    The Magic Pro utilizes both the GPS and GLONASS satellite systems.

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  13. halley

    halley Well-Known Member

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    One antenna on the Mavic, two sets of global satellites giving independent positioning data, two algorithms in the Mavic reading from all the data. This would be called "one receiver."

    My understanding of the selection criteria is as follows: if there are not enough GPS satellites to achieve a lock, but there are enough GLONASS are available, it uses the GLONASS as a backup scheme. If there are enough GPS satellites, it ignores the GLONASS data entirely.
     
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  14. fschilder

    fschilder Member

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    Where do you draw this conclusion from?
     
  15. deckdog

    deckdog Member

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  16. halley

    halley Well-Known Member

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    fschilder, fair question and I did a bit of digging. I am sure I've read that specific conclusion (or heard it in a video) but can't find that information after a reasonable search now. I could be wrong, but I will lay out my reasoning.

    That said, it appears DJI uses the u-blox line of GPS processing chips, as they're popular and well-integrated. The first package that supports GLONASS at all seems to be the u-blox NEO-7 line, and I dug into the technical specifications datasheets for NEO-7 and NEO-8. The datasheet does not support my statement above that it would ignore GLONASS if satisfied by GPS, but it doesn't deny it either. Further, it has a nice summary of the technical differences in GLONASS:

    https://www.u-blox.com/sites/defaul...verDescrProtSpec_(GPS.G7-SW-12001)_Public.pdf

    As I work with embedded systems quite a bit, I understand that when there are two sensors or two data sources, there has to be a strategy to select which input to trust, and which input to combine, and what math would be used to combine, those signals from different sources. Everything I have seen in the datasheets shows that you would calculate a position from GPS, and you would calculate a separate position from GLONASS, given their distinct timing methodologies. Given that GLONASS is seen as (1) less accurate than GPS, and (2) has to account for leap seconds in UTC which are informed from the GPS system, we can see that it is currently a second-tier less-desirable source of information. The datasheets for the u-blox NEO-7 and NEO-8 chipsets do not specify the selection strategy between GPS and GLONASS. They likely see this as an uninteresting internal detail, or a competitive secret.

    So at this time I can't find the DJI's preference for GPS over GLONASS specifically in the datasheets. It stands to reason (my reasoning at least) but it's not backed up by any evidence I could find this morning.
     
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  17. devinrhall

    devinrhall Well-Known Member

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    Are you talking about a warranty that you get with the Mavic or the DJI care refresh?


    Devin
     
  18. duelingglove

    duelingglove Well-Known Member

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    I just my put lil bird up for a few mins of flight and it jumped until it locked into gps mode, no issues with flying btw


    Sent from
     
  19. deckdog

    deckdog Member

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    DJI is fixing under the standard warranty that comes with no extra cost. They already shipped it back to me but unfortunately it is still in UPS's possession.


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