DJI - Lost GPS mid-flight?

Discussion in 'Aerial Photography' started by adamhiram, Jul 2, 2019.

  1. adamhiram

    adamhiram No longer a newbie, moving up!

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    Okay, this seriously can't be normal.

    Pre-flight check
    • IMU accelerometer and gyroscope bias excellent (very low)
    • Compass interference excellent (very low)
    • GPS locked with 10 satellites
    At a height of 391 ft directly overhead, and only 1:20 into my flight, these errors start popping up:
    • Compass Error. Exit P-GPS Mode
    • IMU heading error. Please restart the aircraft.
    • Weak GPS signal. Positional accuracy may be compromised. Please fly with caution.
    • Abnormal compass function or GPS signal detected. Aircraft switched to ATTI mode.
    By the time I was able to regain control, it had drifted off course by a quarter mile with no line of sight. I was able to navigate back by finding familiar landmarks in the live feed and quickly landed, but again, this seems highly unusual. I have had countless other flights in the same area with no issues, this just seems to happen from time to time.

    drone error (2019.08.29).jpg


     
  2. adamhiram

    adamhiram No longer a newbie, moving up!

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    Well, I finally found an explanation, and unfortunately it appears to be a common bug with the Spark with no real fix. It sounds like the best course of action is to try to avoid strong cross-winds, switch to sport mode if it starts to fly away, and look for familiar landmarks to fly back in ATTI mode if the aircraft is still in range. Explanation here.

     

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