The National Centers for Environmental Information (NCEI) has released the World Magnetic Model 2025 (WMM2025), providing more precise navigational data for various applications. This update includes two versions: the standard WMM2025 and a high-resolution version with improved accuracy.
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, one of the key tools developed to model the change in Earth's magnetic field, has been released. The WMM is a spherical harmonic model of the Earth’s main magnetic field and its slow temporal change. The WMM is key to global navigation, ensuring that technological systems relying on the Earth’s magnetic field operate correctly. The World Magnetic Model 2025 (WMM2025) provides more precise navigational data for all military and civilian planes, ships, submarines, and GPS units. This year, two versions of the model are being released. In addition to WMM2025, the release includes the first-ever, which includes improved spatial resolution of approximately 300 kilometers at the equator compared to the standard spatial resolution of 3300 kilometers at the equator. Higher resolution provides greater directional accuracy. Users are encouraged to transition to this higher resolution model. The blackout zones introduced in the previous version have been updated in WMM2025 to represent slight shifts in their location. These zones, near the North and South poles, indicate where the Earth’s magnetic field can be unusable for navigation. Arctic polar stereographic images of declination with the north dip magnetic pole and blackout zone indicated. Source: NOAA NCEIBecause the WMM is crucial for accurate navigation and the Earth’s magnetic field changes in unpredictable ways over time, particularly over periods longer than a few years, the WMM is updated at least every five year
WORLD MAGNETIC MODEL NAVIGATION MAGNETIC FIELD WMM2025 GPS
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