Magnetic declination is the angle between magnetic north & true north. As the Earth's magnetic field varies over time, the positions of the north & south magnetic poles gradually change. The isogonic lines for the years 1590-2020 buff.ly/31Jsh2V (https://buff.ly/31Jsh2V)

https://nitter.moomoo.me/Rainmaker1973/status/1647507245280763905#m