I was in a descending procedure from a higher altitude and came at say 40 m over the church’s metal roof. I deviated to the yard and all went well down to landing. But uploading the flight data to AirdataUAV I noticed the AC has recorded a compass error warning exactly when the bird had to deal with the large church’s metal roof.
Ideea is the compass doesn’t like at all any large metal surfaces, so you would better avoid flying over such. There are known cases (see on YT) with drones that crashed following a flight over / around a ship, the huge metal surfaces compromising permanently the compass.
I had to fly these days around a huge Liebherr 1600 crane, involved on a highway construction. Uploading the flight to AirdataUAV, I found that the max compass turn rate per 0.1 seconds became 11.50 value which is huge compared to values as 3.50-6.00 I usually get. This is still inside the acceptable span of 15-16 degrees per 0.1 seconds, but it’s obvious the bird didn’t liked at all the vicinity of the crane.
If you were 40 metres above a
steel roof your drone's compass would not even detect it.
As mentioned in post #5 you would have to get much closer - try it some time.
The explanation is more likely related to something else.
Airdata is not really useful for investigating incidents as it shows a brief summary.
Use the Phantomhelp log viewer to see the actual data.
Idea is the compass doesn’t like at all any large metal surfaces, so you would better avoid flying over such. There are known cases (see on YT) with drones that crashed following a flight over / around a ship, the huge metal surfaces compromising permanently the compass.
This doesn't sound right at all.
The compass is flying all day long within the magnetic field of the earth without problems.
If it's flown close enough into the magnetic field of a large enough iron/steel object, its idea of where magnetic north is will deviate.
Fly out of the magnetic field and everything is back to normal.
There are known cases (see on YT) with drones that crashed following a flight over / around a ship, the huge metal surfaces compromising permanently the compass.
I had to fly these days around a huge Liebherr 1600 crane, involved on a highway construction. Uploading the flight to AirdataUAV, I found that the max compass turn rate per 0.1 seconds became 11.50 value which is huge compared to values as 3.50-6.00 I usually get. This is still inside the acceptable span of 15-16 degrees per 0.1 seconds, but it’s obvious the bird didn’t liked at all the vicinity of the crane.
How close were you to the crane?
You would have to be extremely close to see any compass effect.
Every week I fly over and around ships without any issues at all.
There's a lot more steel in these than in a crane.
If it was the way you are describing it, I wouldn't be able to do this.
Stop making guesses based on Airdata.
Find out the real caused of what Airdata was hinting at.
Go back and try what I suggested in post #5 to see how this really works.
