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Project Drunken Sparrow (link to thread)

Discussion in 'Phantom 2 Vision Discussion' started by ianwood, May 29, 2014.

  1. ianwood

    ianwood Taco Wrangler

    Jan 7, 2014
    Likes Received:
    Lost Angeles
    This applies to Vision and Vision+ owners too: viewtopic.php?f=19&t=16598

    For those not familiar with the Compass Declination Defect

    If you live in:

    • Western US and Canada
    • Northeastern US and Canada
    • Eastern OZ and all of NZ
    • Northeastern South America
    • Southern Africa

    This applies to you:

    • Affects all P2x in areas of high magnetic declination (+/-8 or higher).
    • Curved flight and hooking is worst when first flying. It improves during flight but may take several minutes.
    • Once power is removed, the P2 forgets any adaptions it made during the previous flight.
    • It appears to not affect the P1.
    • Areas with very high declination will experience TBE during initial hover.
    • Several people have returned their P2x thinking it was defective only to get a new one with the same problem.
    • This is a firmware defect. Possibly a signing bug in the code.
    • This defect is still present in versions 2.0 and 3.0 of the firmware.
    • Measuring the angle between initial true heading and initial course lock heading will give you the real margin of error.
    • Rotating the compass is not a recommended workaround.
    • Using a very rough bottom up model, it is expected that at least 1 in 4 P2x users experience this problem.
    • "Beta testers" have submitted data to DJI for analysis. We are waiting on DJI to provide us with an update.

    See this post for more detail on the issue: viewtopic.php?f=19&t=10317

    Follow the link at the beginning of the post for what we're trying to do about it.

  2. Don the builder

    Jan 12, 2014
    Likes Received:
    Los Angeles, California
    I watched the video on the link and read a number of the comments, as I too am here in LA I have experienced this not every flight but from time to time it is very pronounced.
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