frankengels
lvl.4
Flight distance : 2273796 ft
Belgium
Offline
|
hallmark007 Posted at 2018-3-15 17:08
That is total rubbish, there will be no difference in declination when moving 10 km . Can you tell me why it’s 10km with Mavic Pro and 50 km with Mavic Air, never unless app tells you to with spark same with P4Pro inspire matrice .
Calibration gives the compass the information it needs to determine which magnetic influences are part of the Mavic and what is the earth's normal magnetic field.
You statement is partly correct, and the statement of @bjr981s "magnetic true" is also correct.
I agree that it is not necessary the distance affecting the calibration, but it can.
The magnetic earth field is not linear and not stable over the time, so depending where are you living or flying the effect can differ strongly.
I moved already about 1000km with my Mavic and no compass calibration was needed but on the other hand over the time of 1,5 years I had to re-calibrate 3-4 times.
I noticed also that during 2 switch to ATTI occurrences the compass calibration was slightly off, but not enough to trigger the calibration notice, it was still in the "Good" status. As one of these locations was my common flying field, where I calibrated the Mavic some weeks before , I decided to test. The result was that I could trigger the switch to ATTI and that a calibration was needed.
Please note that also the compasses of real airplanes are periodically re-calibrated and that known magnetic anomalies are displayed on aviation maps.
Depending where you are the changes of earth magnetic field are more ore less affecting a compass, where the magnetic declination is one factor besides solar winds and other local factors.
If interested:
https://en.wikipedia.org/wiki/Earth%27s_magnetic_field
https://www.swpc.noaa.gov/products/planetary-k-index
|
|