What is another word for magnetic declination?
Pronunciation: [maɡnˈɛtɪk dɪklɪnˈe͡ɪʃən] (IPA) 
Magnetic declination is the angle between magnetic north (the direction a compass needle points) and true north (the direction towards the North Pole). There are several synonyms to describe magnetic declination, including magnetic variation, compass variation, magnetic deviation, and geomagnetic declination. Magnetic variation is commonly used by mariners to describe the difference between true and magnetic north. Compass variation refers to the angular difference between true and magnetic north as measured by a compass. Magnetic deviation is used to describe the difference between the magnetic north indicated by a compass and the actual north. Finally, geomagnetic declination is used to describe the spatial variation of the Earth's magnetic field.
