first flyaway please help decipher

[rickmorrisonsr]

Couldn't figure out how to convert dat file.
Opened it and here is the content.

Can someone please help me decipher this flyaway flight?

[["2017-11-14 13:33:26","","Home Point Recorded. RTH Altitude: 50m."]],[["2017-11-14 13:40:33","Warning","In Flight, working compass encounters magnetic-field interference,please switch to atti mode if craft behave abnormally"],["2017-11-14 13:40:37","Warning","Compass Redundancy Switch"]],[["2017-11-14 13:46:12","Warning","In Flight, working compass encounters magnetic-field interference,please switch to atti mode if craft behave abnormally"],["2017-11-14 13:46:16","Warning","Compass Redundancy Switch"]],[["2017-11-14 13:47:33","Warning","In Flight, working compass encounters magnetic-field interference,please switch to atti mode if craft behave abnormally"],["2017-11-14 13:47:38","Warning","Compass Redundancy Switch"]]

 

[VegasFlyer]

Couldn't figure out how to convert dat file.
Opened it and here is the content.

Can someone please help me decipher this flyaway flight?

[["2017-11-14 13:33:26","","Home Point Recorded. RTH Altitude: 50m."]],[["2017-11-14 13:40:33","Warning","In Flight, working compass encounters magnetic-field interference,please switch to atti mode if craft behave abnormally"],["2017-11-14 13:40:37","Warning","Compass Redundancy Switch"]],[["2017-11-14 13:46:12","Warning","In Flight, working compass encounters magnetic-field interference,please switch to atti mode if craft behave abnormally"],["2017-11-14 13:46:16","Warning","Compass Redundancy Switch"]],[["2017-11-14 13:47:33","Warning","In Flight, working compass encounters magnetic-field interference,please switch to atti mode if craft behave abnormally"],["2017-11-14 13:47:38","Warning","Compass Redundancy Switch"]]

Perhaps others can add more to the "Compass Redundancy Switch" message, but a Google search will be faster. This is the search I used: compass redundancy switch phantom 4 pro

Your P4 ran into some heavy magnetic interference that it had trouble coping with. It's hard to say exactly what caused the magnetic interference other than it was something along your flight path.

Here is a better view of the dat file contents. You can use any plain text editor to open it. (like notepad if you're on Windows)

[
["2017-11-14 13:33:26","","Home Point Recorded. RTH Altitude: 50m."]
],
[
["2017-11-14 13:40:33","Warning","In Flight, working compass encounters magnetic-field interference,please switch to atti mode if craft behave abnormally"],
["2017-11-14 13:40:37","Warning","Compass Redundancy Switch"]
],
[
["2017-11-14 13:46:12","Warning","In Flight, working compass encounters magnetic-field interference,please switch to atti mode if craft behave abnormally"],
["2017-11-14 13:46:16","Warning","Compass Redundancy Switch"]
],
[
["2017-11-14 13:47:33","Warning","In Flight, working compass encounters magnetic-field interference,please switch to atti mode if craft behave abnormally"],
["2017-11-14 13:47:38","Warning","Compass Redundancy Switch"]
]

 

[Meta4]

Can someone please help me decipher this flyaway flight?

If you go to DJI Flight Log Viewer
Follow the instructions there to upload your flight record from your phone or tablet.
Come back and post a link to the report it provides and someone might be able to analyse it and give you an understanding of the cause of the incident.

Also it would help if you can provide a description of what happened.

 

[rickmorrisonsr]

here is a link to the report of my flyaway. please help me decipher.
DJI Flight Log Viewer - PhantomHelp.com

 

[rickmorrisonsr]

If you go to DJI Flight Log Viewer
Follow the instructions there to upload your flight record from your phone or tablet.
Come back and post a link to the report it provides and someone might be able to analyse it and give you an understanding of the cause of the incident.

Also it would help if you can provide a description of what happened.

Thanks for the help! done

 

[sar104]

here is a link to the report of my flyaway. please help me decipher.
DJI Flight Log Viewer - PhantomHelp.com

Are you sure that's the right flight? That flight record ends 9 ft from the takeoff point at an altitude of 5 ft.

 

[Meta4]

here is a link to the report of my flyaway. please help me decipher.
DJI Flight Log Viewer - PhantomHelp.com

That log was from a flight that was all low and slow with much of the flight in Tripod mode and no sign of any problem.

 

[rickmorrisonsr]

That log was from a flight that was all low and slow with much of the flight in Tripod mode and no sign of any problem.

The flyaway started at 15m24s. That’s also when the log shows compass error and speed and altitude changes. Speed up to 20mph. Also u can see the red arc in the flight path photo where the flyaway began and ended. At that point the p4 stab

 

[rickmorrisonsr]

Here is the flight.

6A4B7AAD-EA73-4D52-8A0B-BBA4A751FF3D

• rickmorrisonsr
• Nov 16, 2017

Flyaway 20171114

F66C981D-09B1-453A-A437-277D4BF049B6

• rickmorrisonsr
• Nov 16, 2017

Flight 20171114

 

[Meta4]

The flyaway started at 15m24s. That’s also when the log shows compass error and speed and altitude changes. Speed up to 20mph. Also u can see the red arc in the flight path photo where the flyaway began and ended. At that point the p4 stab

The flight route is too tangled to work out which way it's going.
Did it start acting up over the parking lot or did it finish when it got there?
Your Phantom was quite low to the ground.
What is the surface of that parking lot?
Is it asphalt or concrete?
Was the Phantom close over any cars?

 

[rickmorrisonsr]

Entire shoot was close to the ground until flyaway. Shooting a construction site with literally tons of huge rebar. Not over cars until flyaway.

 

[Meta4]

Entire shoot was close to the ground until flyaway. Shooting a construction site with literally tons of huge rebar. Not over cars until flyaway.

Flying low over lots of steel is asking for compass problems.
It's a detail you could have given a lot earlier.
That's all the problem was - not a flyaway at all.
You flew low in a magnetic field associated with the steel.
Your compass had problems not knowing which way it was pointing and that's what you observed.
Don't fly low over lots of steel.

 

[rickmorrisonsr]

Flying low over lots of steel is asking for compass problems.
It's a detail you could have given a lot earlier.
That's all the problem was - not a flyaway at all.
You flew low in a magnetic field associated with the steel.
Your compass had problems not knowing which way it was pointing and that's what you observed.
Don't fly low over lots of steel.

Thanks. That notwithstanding...we shot for 45 minutes low over lots of steel without loss of control.

 

[Meta4]

Thanks. That notwithstanding...we shot for 45 minutes low over lots of steel without loss of control.

It's a function of how much steel and what distance away.
At some point you got to a point where the magnetic field of the steel was stronger than the earth's normal magnetic field.
You can experiment to see how it works.
Go back and slowly descend towards a lot of steel, or do it above a steel roof.
At some point, your Phantom will start to slowly spiral. If you stay there it will be tricky to steer.
Climb out of the magnetic field and the Phantom is back to normal.
But flying low over a lot of steel is not a good idea for safe flight.
At 20+ feet up you wouldn't have had any problem.

 

[rickmorrisonsr]

It's a function of how much steel and what distance away.
At some point you got to a point where the magnetic field of the steel was stronger than the earth's normal magnetic field.
You can experiment to see how it works.
Go back and slowly descend towards a lot of steel, or do it above a steel roof.
At some point, your Phantom will start to slowly spiral. If you stay there it will be tricky to steer.
Climb out of the magnetic field and the Phantom is back to normal.
But flying low over a lot of steel is not a good idea for safe flight.
At 20+ feet up you wouldn't have had any problem.

Very good input. Thanks for your expertise!