My Mavic Pro's GPS went bad!!

FlyingFilmmaker · Jul 7, 2020

sar104 said:
All the issues in the flight that you posted were due to insufficient GNSS satellite reception.

I'm assuming that GNSS satellites are the GPS satellites? Sorry for the ignorant question. The thing is that I have the same problem when I have full reception (eg at 400 feet no obstacles). Maybe I'll post a flight log with the issue when I'm flying higher with better GPS reception.

FlyingFilmmaker · Jul 7, 2020

sar104 said:
All the issues in the flight that you posted were due to insufficient GNSS satellite reception.

In terms of compass data, compass 0 was active and the magnetic data look good enough not to have cause the problem.

Here's another set of flight logs from a flight where I was at about 400 feet and had 16-18 satellites. The drone still was flying to the side (not straight) as before. If you'd be willing to look this one over and analyze it too I would really appreciate it.

AC .DAT logs DJI_ASSISTANT_EXPORT_FILE_2020-07-07_12-11-06.DAT

DJI GO 4 TXT logs

FlyingFilmmaker · Jul 10, 2020

Anyone?

sar104 · Jul 10, 2020

You have significant disagreement between the compasses, which I'm sure is the source of the problem. The track follows the IMU heading but that is clearly wrong. In this flight it is initialized to compass 0, but then the inertial solution deviates from the magnetic values:

Anyway - it has nothing to do with the GPS data - that's all good. If calibrating the compasses isn't fixing it then you will probably need to demagnetize the aircraft.

FlyingFilmmaker · Jul 10, 2020

sar104 said:
You have significant disagreement between the compasses, which I'm sure is the source of the problem. The track follows the IMU heading but that is clearly wrong. In this flight it is initialized to compass 0, but then the inertial solution deviates from the magnetic values:

Anyway - it has nothing to do with the GPS data - that's all good. If calibrating the compasses isn't fixing it then you will probably need to demagnetize the aircraft.

Wow, thanks so much. That at least gets me headed in the right direction.