Magnetic declination is not such a big thing in the UK because being a small island the variation is negligible.
But in other parts of the world there is a huge difference.
I was a little taken back when i realised that between the Outer Hebrides and the east coast of Scotland that there is a 3 degree difference.
So if you are in need to know what the declination is in your local area or if your planning a longer trip that needs careful navigation then this website may be of assistance to you. I hadn’t come across it before and so thought i would share it.