During the last deployment of the blue-Rov it was not possible to get the control. Qgroundcontrol showed there were problems with the magnetic field. I closed the program and started it again, and the problems were obsolete.
Hi!
I have had that of two different reasons:
1 Working close to metal, like wrecks, powercables.
Solution: be aware of that and do not use auto heading but manual control.
2 Calibration error on ROV at start.
Restart of ROV usually solve that, if not Recalibrate.