The latest version of the World Magnetic Model (WMM), a crucial tool for modeling Earth’s magnetic field changes, has been released. The WMM 2025 provides more precise navigational data for various technological systems reliant on the Earth’s magnetic field.
Key features of the new model include improved spatial resolution, which offers greater directional accuracy, and updated blackout zones near the North and South poles. These zones indicate areas where the magnetic field can be unusable for navigation.
The WMM is updated every five years to ensure accurate navigation, as changes in the Earth’s magnetic field over time are unpredictable. The model is used by governments, organizations, and companies worldwide, including those with international remits such as NATO and the International Hydrographic Organization.
Developed jointly by NOAA National Centers for Environmental Information (NCEI) and the British Geological Survey (BGS), the WMM is a standard tool for accurate navigation and research into Earth magnetism. NCEI plays a critical role in its development, maintenance, and distribution, collaborating with partners to conduct research and improve the model’s accuracy.
The new release also includes the World Magnetic Model High Resolution (WMMHR2025), which offers improved spatial resolution of approximately 300 kilometers at the equator compared to the standard resolution. This update aims to provide greater directional accuracy for users transitioning to this higher resolution model.
Source: https://www.ncei.noaa.gov/news/world-magnetic-model-2025-released