Erratic GPS Mode

mikeve · Feb 28, 2016

Hi Gang

Tried to fly this afternoon. A bit windy. Anyway, got to hover at about 3 m and it starts to drift erratically. I try to land but had too much drift (my fault). Broken prop only damage (phew).

Uploaded the log to HD -

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and you can see that I never had less than 10 GPS sats, but the mode kept flipping back and forth between GPS and ATTI.

Any bright ideas, please?

Tdeath · Feb 28, 2016

Atti mode will kick in whenever there is low gps count or when your compass get interference ( which is usually the case ).

In my experience, when i fly in an area with strong interfernce (litchi will pop a message sayin compass calibration within seconds) and usually stay in gps mode
However the go app will not warn me until it switched to atti mode

mikeve · Feb 28, 2016

Thanks Tdeath. It must have been interference because 10 sats (the minimum that I had) is rated as "Good" by HD, correct?

Trackman1 · Feb 28, 2016

Mine did the same thing. Took off and it was not holding position. It was windy. I just kept it away from trees.
After what was probably only 30 seconds it held position. I don't think it had a good lock on the sats at first.
I was in GPS mode all the time.

Trackman1 · Feb 28, 2016

Mike. Just noticed. We are not far apart.

Tdeath · Feb 28, 2016

Also from my experience, compass will go crazy if u take off from certain areas of ur home so learn them.

My advice whenever u get compass error or atti mode and the ac starts drifting at low altittude ? Shoot it up sky high and simply account for wind direction from the way its drifitng ( you can do this using los or the map in go app) keep flying till u gps mode back or simply try to land it in a different open area.