Geebax
 Captain
Australia
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Roadstar1700 Posted at 2018-10-22 19:51
Firstly, the compass is located in the bottom of the landing leg, so it is very close to any rebar in the concrete. Secondly, compass calibration is designed to tell the on-board system what parts of the magnetic pattern surrounding the aircraft belong to the aircraft itself
I agree with this.
No, I was not saying that if you fly near a metal structure the compass will not be affected. I was saying, quite clearly I thought, that compass calibration has nothing to do with calibrating the compass for navigational purposes.
The compass is initialised at power on, and if you do so while it is sitting close to a ferrous object, the aircraft will not always detect it, and can take off then experience confusing readings.
Flying near metal objects may or may not affect the compass. Firstly, it can only do so if it is a ferrous metal object, meaning iron or steel. Other metals will have no effect. And even so, it has to be a very large object to have any effect and you have to get really close it is before it affects the compass.
I was going to answer your point about calibrating the compass when you move a significant distance, this is not correct either, but I see Labroides has already addressed that point.
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