quanthonytrang
Second Officer
Flight distance : 419980 ft
Australia
Offline
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I don't calibrate on every flight. I use common sense by looking around at the environment.
Here is the logic...
When the phantom is on, it spends most of the time in the sky. When its high up, it has minimal magnetic interference/influence.
Users need to mimic the same conditions in the sky, but on the ground when calibrating. Hence all calibrations should be done at an open grassy field free of magnetic influence. Its best to find a field nearest to your flight location if you need to calibrate. Just use google maps.
The reason for the compass failures is that when the compass is calibrated near metal structures (rebar/buildings etc), it becomes influenced and a false "NORTH" is primed. When you take off and move further away higher into the sky, the magnetic influence is less and a the realistic north appears. This will now provide conflicting data to the fight controller and hence the P4/P3 will switch to ATTI to prevent fly-aways.
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