The magnetic lines of the Earth’s magnetic field are not straight lines, all spread equally around the Earth. They’re straight and horizontal close to the Equator (0° of magnetic inclination), but the higher the latitude, the more these lines tend to converge towards the Earth’s poles. Therefore, they will become more and more inclined until being fully vertical at the pole (90° of magnetic inclination). As a consequence, the magnetic compass used to indicate the magnetic heading, will also increasingly tilt towards its vertical, as it approaches the pole.