Is there an update for the function igrfmagm?

When I call the function inside a for loop I get the Warning:

In igrfmagm (line 109)

In

flat_grid_test4_B (line 57)

Warning: This generation of the International Geomagnetic Reference

Field is no longer current. See the documentation of International

Geomagnetic Reference Field for the latest supported generation.

[Torsten]

Answer from AI:

This warning occurs in MATLAB when using the IGRF (International Geomagnetic Reference Field) model with a date that exceeds the validity of the coefficient file currently in your MATLAB path. The IGRF model is updated every five years, and the 14th generation (IGRF-14) was released in late 2024.

To resolve this, you must update the IGRF coefficients file (igrfcoefs.mat).

How to Fix the Warning

Method 1: Update the "m_IGRF" File Exchange Toolbox (Recommended)

If you are using the popular m_IGRF package from the MATLAB Central File Exchange (by Drew Compston/William Brown), follow these steps to update to IGRF-14:

1. Download Latest Version: Visit the GitHub repository wb-bgs/m_IGRF or the MATLAB File Exchange International Geomagnetic Reference Field (IGRF) Model.
2. Replace .dat Files: Replace the old *grf*.dat files in the datfiles subfolder with the new ones provided in the updated download.
3. Run getigrfcoefs: Run the getigrfcoefs.m script to generate a new igrfcoefs.mat file.
4. Update Path: Ensure the updated igrfcoefs.mat is in your MATLAB path.

Method 2: Update Aerospace Toolbox (Simulink/MATLAB)

If you are using the built-in igrfmagm function from the Aerospace Toolbox:

• Update MATLAB: The IGRF block in Simulink and the igrfmagm function were updated to support IGRF-14 in R2025a.
• Specify Generation: In igrfmagm, you can explicitly set the generation to 14:matlab[XYZ, H, D, I, F] = igrfmagm(height, lat, lon, decyear, 14);

Why this happens

The IGRF model provides definitive coefficients up to 2020.0 and predictive data for 2020–2025 (IGRF-13) or 2025-2030 (IGRF-14). If your decimalYear input is, for example, 2026, and you are using IGRF-13, MATLAB warns you that the model is no longer current and is extrapolating.

Latest Generation: As of early 2025, IGRF-14 is the current generation.