Q. How frequently is the World Magnetic Model (WMM) updated?
Answer: Every five years
Notes: The World Magnetic Model (WMM) is updated every five years to assist in recalibrating navigational systems like GPS. This model accounts for changes in the Earth's magnetic field, which can shift due to various geological processes. The WMM was notably revised in February 2019 ahead of schedule due to significant movements of the magnetic North Pole, impacting navigation accuracy.