Naza F550 yaws by itself in GPS mode

[NerV-Runna]

I just finished building an F550 with Naza + GPS.

She flies beautifully, but occasionally yaws by 5-40 degrees spontaneously.
Once even spun 360.

Transmitter I'm using is futaba 8j. With s-bus.
Everything is calibrated and setup correctly.

Any ideas?

Thanks

G

 

[hjls3]

magnetic declination. might be that your gps unit needs to be positioned a little off center. i live in colorado and my gps is about 20 degrees off center.

 

[NerV-Runna]

I have my declination set to -20 degrees.

 

[DesJardins]

If it's intermittently yawing' I would try changing the compass a bit as well as what are your basic Yaw gains at?

 

[NerV-Runna]

140 140 120 180
100 100