True North Magnetic Compass Calibration

A magnetic compass needle will always point to magnetic north. It is not necessary to recalibrate the compass when the vehicle is flown at a new location because ardupilot includes a world magnetic model which allows converting the locations magnetic north to true north without recalibrating. In addition the locations inclination is calibrated at startup and then again soon after takeoff.

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True north magnetic compass calibration. What we think of as the top of the globe is referred to as true north magnetic north where your compass needle actually points is a function of earths magnetic fields and its core elements which fluctuate in complicated ways. To calibrate a compass properly you must understand that magnetic north and true north are not the same directional value. So if you happen to be directly south of where magnetic north pole is or exactly opposite that on the other side then there is no difference to what the compass shows and what is true north. Declination is positive east of true north and negative when west.

True north magnetic compass calibration morrison st. Also why it differs from tv towers usa because of this. Magnetic declination sometimes called magnetic variation is the angle between magnetic north and true north. Magnetic declination changes over time and with location.

In fact magnetic north is approximately 1000 miles away from the true north pole and the distance between these two points can. But the further you move either east or west so if you go the furthest east youd be in iceland and furthest west youd be in japan those areas experience the worst distortion on the same. This shows how the ios compass app can be set to use true instead of magnetic north. Currently magnetic north is roughly north of hudson bay in canada.