Problems with GPS

Hi, good afternoon, how are you?
First of all I wanted to apologize for the space, I know it’s not the forum’s specialty, but I think I can get some help.
I work with a fleet of drones, and recently I went on a flight and I noticed instability in some drones, this one in particular, started doing the “toilet bowl” movement and then it opened.
Could anyone tell me the reason why drones do this toilet bowl move?
If the fault is in the GPS, is there anything that can improve the drone’s accuracy?
Follow the logs:
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Thank you very much for those who are willing to help, good week and hugs!

No GPS to blame but bad compass calibration.

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Electrical interference?

Or possible the GPS was not coaligned with the fc?

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Oh thank you very much!
Usually I only do a compass when the GC asks, because as we fly with a high fleet, we would lose a lot of battery in making a beat in all of them.
But thanks so much for the info!

Good afternoon @jax200 , thank you very much for your response and willingness!
About alignment I don’t think it’s the cause, we currently use GPS right on top of FC.
About electrical interference, I can’t tell you because I don’t have much knowledge about it, but this could be the problem.

The GPS can be directly on top of the fc and still not be coaligned. This will result in a conflict of directionality between the two inputs.

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Ohh, I’m sorry, I got it wrong.
Both are co-aligned in the same direction, even though we only fly with the GPS compass and disable the FC compass.

A wonder how a swarm of over 1800 drones at Tokyo 2020 using RTK GPS and wireless mesh communications got it right !!

Ah… now it makes sense. But the issue of toilet bowling can be due to bad or uncalibrated IMU.

… or GPS signal fidelity can be affected by local structures or EMI.

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Thank you very, very, very much for the response and content! I will read it calmly and absorb as much as possible!

I would also suggest doing an internet search for other solutions as these articles might be a little technical or not relevant.

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Thank you! I’ve been looking for related content, but because it’s something kind of recent and closed, I can’t get much information, I need to get the answers in individual drones/fpv to be able to apply it to the fleet.