How to make compas's arrow heading to certain point?

Question

I have this code:

using System.Reflection.PortableExecutable;

namespace MauiApp1;

public partial class MainPage : ContentPage
{

    public MainPage()
    {
        InitializeComponent();
    }

    double kaliningradlongitude = 54.70934095352097;
    double kaliningradlatitude = 20.469516749819515;

    double tokyolongitude = 35.76242245296096;
    double tokyolatitude = 139.261582628989;


    private void ToggleCompass()
    {
        if (Compass.Default.IsSupported)
        {
            if (!Compass.Default.IsMonitoring)
            {
                // Turn on compass
                Compass.Default.ReadingChanged += Compass_ReadingChanged;
                Compass.Default.Start(SensorSpeed.UI);
            }
            else
            {
                // Turn off compass
                Compass.Default.Stop();
                Compass.Default.ReadingChanged -= Compass_ReadingChanged;
            }
        }
    }

    private void Compass_ReadingChanged(object sender, CompassChangedEventArgs e)
    {
        // Update UI Label with compass state
        this.text.Text = $"{e.Reading} + {this.arrow.Rotation}";
        this.arrow.RotateTo(e.Reading.HeadingMagneticNorth - RadianToDegree(Bearing(tokyolongitude, tokyolatitude, kaliningradlongitude, kaliningradlatitude)));
    }
    public static double Bearing(double pt1long, double pt1lat, double pt2long, double pt2lat)
    {
        double x = Math.Cos(DegreesToRadians(pt1lat)) * Math.Sin(DegreesToRadians(pt2lat)) - Math.Sin(DegreesToRadians(pt1lat)) * Math.Cos(DegreesToRadians(pt2lat)) * Math.Cos(DegreesToRadians(pt2long - pt1long));
        double y = Math.Sin(DegreesToRadians(pt2long - pt1long)) * Math.Cos(DegreesToRadians(pt2lat));

        // Math.Atan2 can return negative value, 0 <= output value < 2*PI expected 
        return (Math.Atan2(y, x) + Math.PI * 2) % (Math.PI * 2);
    }
    private double RadianToDegree(double angle)
    {
        return angle * (180.0 / Math.PI);
    }

    public static double DegreesToRadians(double angle)
    {
        return angle * Math.PI / 180.0d;
    }

    private void Button_Clicked(object sender, EventArgs e)
    {
        ToggleCompass();
    }
}

I have the most western point = Kaliningrad, and the most eastern point = Tokyo. What do I want? I want to make compas's arrow heading to Tokyo (as if I'm in Kaliningrad) depending where I look. Let's imagine that Tokyo is on East and compas's arrow must head to East, even if I look at South or North and etc. Now my compas's arrow is buggy and don't work properly.