variations in the planet earth's magnetized industry over time and location.
identify magnetic declination.
In navigation, at confirmed destination and time, the horizontal position involving the true north and magnetic north assessed east or west in accordance with whether magnetized north lies east or west of true north.
In cartography, the yearly change in way of horizontal component of the Earth’s magnetic area.
just like magnetic declination.
the position (at a particular area) between magnetic north and real north