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Altitude reading off

Discussion in 'Pro/Adv Discussion' started by exit 4, Feb 20, 2016.

  1. exit 4

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    I've noticed lately that my altitude is way off. I was standing looking at my p3a just over my head and the go app said the altitude was 54 feet. That is way off. Anyone else have this problem? I don't mind 5-10 feet, but this is scary. Anything that I may program preflight could be in trouble. Any ideas?
     
  2. With The Birds

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    Start with an IMU calibration.
     
  3. MedinaTaylor

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    Yeah, that seems to be common.

    The Phantom uses the barometer to estimate altitude.

    Keep that in mind for long flights
     
  4. exit 4

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    IMU it is, first thing tomorrow.
     
  5. Phantom751874

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    The barometer on these P3's is a bit wonky. They are generally off. Land and power cycle the P3 and see. Might have to do it a few times.

    I don't believe an IMU calibration will make any difference at all. I've had flights where it's accurate within a few feet and then flights where it's off by 20-30ft and then back to accurate agiain the next flight. That's just the way the barometer is.
     
  6. sevy15

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    Also don't forget where u take off from is ground zero so any elevation changes of the landscape will give silly altitude readings


    Sent from my iPhone using PhantomPilots mobile app
     
  7. GadgetGuy

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    There is definitely a warmup time for an accurate barometer reading at the launch point. That is the critical reading that calibrates what 0 is, and all other elevation/altitude displays are relative to it. So, let it warm up first under battery power, and then recycle power, and you will get a 'fresh' and more accurate reading at the warmer temp, before you take off.
     
    #7 GadgetGuy, Feb 21, 2016
    Last edited: Feb 21, 2016
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