Mark The Droner
Captain
Flight distance : 2917 ft
United States
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Nigel_ Posted at 2018-7-12 02:07
If you take off near a small magnet, like a sunroof electric motor, then the compass will tare|zero|calibrate itself to the magnetic field at takeoff and you will have a compass problem when you leave the small magnetic field at maybe 2 meters distance.
If you take off near a big magnet, like a steel chain-link fence, then the compass will tare itself to the magnetic field at takeoff and you will have a compass problem when you leave the big magnetic field at maybe 15 meters distance.
Here's my understanding and please tell me if you think I'm wrong:
If your compass is already properly calibrated and you take off from a field with no metal around, everything will likely be fine.
If your compass is already properly calibrated and you take off from a steel bridge or something, you may get compass errors, but once you launch and get away from the bridge, the compass will behave correctly and the compass errors will cease. This is, of course, with the assumption that the magnetic field of the bridge wasn't so strong so as to damage the compass calibration.
OTOH, if you are at a steel bridge or something and calibrate the compass at the bridge, you're basically doomed.
Agree? |
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