What is another word for geomagnetic secular variation?
Pronunciation: [d͡ʒˌiːə͡ʊmɐɡnˈɛtɪk sˈɛkjʊlə vˌe͡əɹɪˈe͡ɪʃən] (IPA) 
Geomagnetic secular variation, also known as GSV, refers to the changes in the Earth's magnetic field over time. Synonyms for GSV include magnetic secular variation, magnetic field drift, magnetic field variation, and magnetic secular drift. Other related terms include magnetic declination, which is the angle between true north and magnetic north, and magnetic inclination, which is the angle between the Earth's magnetic field and its surface. All of these factors affect navigation systems and the accuracy of compasses, making understanding GSV an important aspect of Earth science and geology.
