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IMU calibration question

Discussion in 'Pro/Adv Discussion' started by J&L, Mar 24, 2016.

  1. J&L

    J&L

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    Do these numbers look good. I calibrated outside perfectly level.

    [​IMG]


    Sent from my iPad using PhantomPilots mobile app
     
  2. kirk2579

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    yea looks fine,

    did you have it level when you did it??
     
  3. J&L

    J&L

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    Yes. Well according to my iPhone level it was
     
  4. kirk2579

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    sounds good ,

    if you did not after that IMU cal
    maybe recalibrate the compass as well.

    to do that tap the "ready to fly-gps" icon in app to get to menu...
    do away from any metal .

    good luck and have fun flying!
     
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  5. Erroll

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    I am curious as to why you recommend that? The compass mod values shown in the original post are spot on.
     
  6. garykeithmead1

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    +1
     
  7. kirk2579

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    Just a habit I got into a year or to back when doing my p2's,
    always did the compass after the IMU....all part of a mental check list.
    because once I set those I wont redo until an event or update etc.
     
  8. Erroll

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    Fair enough.
     
  9. kirk2579

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    IMPORTANT: A good mod value does NOT mean your compass is working and calibrated properly. For example, if you calibrate next to some rebar, your mod value may still be OK until you fly away from the rebar.


    also see this info post

    Compass Calibration, A Complete Primer
     
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  10. Erroll

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    I understand that, but with that mindset one will NEVER know if one's last calibration was good, unless of course one walks around with a metal detector as part of ones kit.
     
  11. J&L

    J&L

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    Thanks for the info. I did calibrate on my concrete driveway. No Idea if rebar is in it or not.
     
  12. Phantom fool

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    Where I live and plan to fly the soil is chock full of iron ore. Does that spell trouble for me?

    It's a pirates life for me
     
  13. alokbhargava

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    Compass calibration on a concrete platform is not a good idea.
     
  14. Air Ontario

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    Most driveways would have steel "fence wire" rather than actual rebar. However effect is basically same.

    I fly in some high iron soil areas with no issues. It's always the old farm equipment, metal cattle gap cast iron scattered about or similar(that you may not see)that has caused me compass interference.