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K-index seems to be crucial

Discussion in 'General Discussion' started by CallMeAlan, Sep 8, 2014.

  1. CallMeAlan

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    P2V.

    Recent experiences lead me to believe that that silly old K-index is really quite important.

    First experience: it just refused to calibrate, after telling me it needed it. Just wouldn't. I went home.
    Later discovered that K was over 6 that day, possibly even 8.

    Second experience: I now had a K-index app on my phone. It read 4 for the day. I needed to calibrate twice before it was happy, and the LEDs remained solid green, no slow flashing. 7 satellites. It flew, but I felt it was not really awfully happy about it, drifting a bit, slowly yawing without being told to.

    Third, last Saturday. K-index was 2. 10 satellites. No calibration required, LEDs flashing slow green almost immediately, and it flew like a dream, as though it was on rails.

    So, it seems to me we might need to make ourselves quite K-aware. Am I correct in my suppositions?
     
  2. Mal_PV2_Ireland

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    I really haven't noticed any strange behaviour with mine and I always throw an eye to the k index. I've had a few flights while it was showing 6 and I didnt find anything strange.
     
  3. IrishSights

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    I dont think K index affects the compass only the ability to lock satellites.
     
  4. HarryT

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    No, you're not correct.

    K-Index has absolutely nothing whatsoever to do with compass calibration. A high K-index will not affect either the necessity or the ability to calibrate the compass.

    The effect of a high K-index is to increase the "uncertainty" of GPS positioning. The worst that can happen with a high K-index is that your Phantom's ability to hover in place might be degraded from wandering about within a 2m-radius circle to a 5m or even in extreme cases a 10m circle. But it won't affect the ability to get a GPS lock in the first place.
     
  5. N017RW

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    Never paid attention, never had a problem.
    YMMV
     
  6. Happyflyer

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    Is there a record of these values online? I ask because on August 2nd I had a flight that the P2V acted up just as you stated. It wandered all over and was not in atti. Have not had that happen since.
     
  7. dmagnus

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    45.141598 -92.631683 Somewhere on the Apple River
    FWIW: from NOAA