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Different declines on different devices

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Ingensor
Posts: 164
Joined: Mon Nov 25, 2019 10:23 am

Different declines on different devices

Post by Ingensor »

Hello!

I noticed strange behavior. Displayed on different devices in different declination of the same point.
For example,
point: 46.2964753° N 106.7359654° W

On Android 7.1.1 NMF26F - declination + 9.159°
On Android 10 QKQ1.190825.002 - declination + 9.506°
(Screenshot attached)

This is a bug or not? On what android correct declination?
Check, please...


Image
Psyberia-Support
Site Admin
Posts: 6406
Joined: Wed Apr 14, 2010 9:41 pm

Re: Different declines on different devices

Post by Psyberia-Support »

Hi,
This value is computed at your current location (because it's used with the magnetic sensor of your device).
If you want to compare values of remote places, please click on the screen center dot -> Tools -> Information.

Concerning the values, it's not impossible that future versions of Android do compute slightly different results (but it should not be the case with Android 10). Keep in mind that the magnetic field is changing constantly, and we can only use approximation to compute futures locations:
This uses the World Magnetic Model produced by the United States National Geospatial-Intelligence Agency. More details about the model can be found at http://www.ngdc.noaa.gov/geomag/WMM/DoDWMM.shtml. This class currently uses WMM-2015 which is valid until 2020, but should produce acceptable results for several years after that. Future versions of Android may use a newer version of the model.
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User avatar
Ingensor
Posts: 164
Joined: Mon Nov 25, 2019 10:23 am

Re: Different declines on different devices

Post by Ingensor »

I understood.
Thank you very much for your explanation...
:)
User avatar
Ingensor
Posts: 164
Joined: Mon Nov 25, 2019 10:23 am

Re: Different declines on different devices

Post by Ingensor »

Psyberia-Support
If you want to compare values of remote places, please click on the screen center dot -> Tools -> Information.
Hi again!
Unfortunately in the "Information" is also displayed different declination... :roll:
screenshot attached


Image
Psyberia-Support
Site Admin
Posts: 6406
Joined: Wed Apr 14, 2010 9:41 pm

Re: Different declines on different devices

Post by Psyberia-Support »

Unfortunately in the "Information" is also displayed different declination...
It's not unfortunate, maybe Android 10 uses the new WMM2020 which has been released end of 2019, that will give better results for the years to come.
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Ingensor
Posts: 164
Joined: Mon Nov 25, 2019 10:23 am

Re: Different declines on different devices

Post by Ingensor »

Thanks again for your answers! :)
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