No way to get, or calculate, magnetic declination using xamarin essentials?

Question

Essentials Compass- gets me true north. Essentials Magnetometer gets me X, Y, Z. Is X,Y,Z, the magnetic declination, if so, how to use it\convert it (is x the declination?)? You can go to https://www.ngdc.noaa.gov/geomag/calculators/mobileDeclination.shtml (on PC, it says that you should be using mobile device), and it shows me the declination where I am located. Not sure how to get this app on my Android phone (S21+), but anyway, really don't want to have to access online app to get this information to use in my own app. Is there no way of getting this information in Xamarin forms? Thanks.

Answer 1

Hi LouisElston-4087,

Welcome to our Microsoft Q&A platform!

Xamarin provides full access to the underlying platform, so you can get the declination at a specific point by directly calling the Android GeomagneticField API which provides method "getDeclination" to get declination.

Here is the documentation you can refer to: GeomagneticField. You can also find the .Net documentation for this at GeomagneticField.Declination

There is a feature request to add this to Xamarin.Essentials at Feature Request True north heading in Compass. You can like it or add comments with your use case to help prioritize it.

Regards,
Kyle

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Answer 2

If you want a more self contained approach that doesn’t rely on external communication or device native libraries, you can use CoordinateSharp.

https://coordinatesharp.com/DeveloperGuide#magnetic-fields