World Magnetic Model (WMM) coefficient update 2015-2020


This Mapping and Charting Solutions for Desktop patch updates the World Magnetic Model (WMM) coefficients to include years 2015-2020. Please download and install this patch at your earliest convenience.



This patch will install on all 10.1 - 10.3 Mapping and Charting Solutions for Desktop. We recommend customers with the following solutions download and install this patch to ensure magnetic calculations are current.

    Mapping and Charting Solutions 10.1 - 10.3
  • ArcGIS for Aviation
  • ArcGIS for Maritime: Charting
  • Esri Defense Mapping
  • Esri Production Mapping

Issues Addressed with this patch

NIM070489/TFS13966: Implement 2015-2020 World Magnetic Model (WMM) coefficient file into Esri Mapping and Charting Solutions.

Installing this patch

  1. Make sure you have write access to the installation location, and that no one is accessing it.
  2. Select and download the file.
  3. Mapping and Charting Solutions for Desktop 10.1-10.3
    MCS for Desktop WMM 2015 Patch
  4. Unzip the file.
  5. Right click the .exe and choose Run as administrator to start the install process.

How to identify which patch is installed

To find out if this patch was installed on a machine, you will need to look at the WMM.xml file date and ensure it is current. The WMM.xml file is installed to the bin directory. Since this patch installs on many different Mapping and Charting versions, use Search to find the WMM.xml.


Check Online Support Center periodically for the availability of additional patches. New information about this patch will be posted here.

Getting Help

If you are in the United States, please contact Esri Technical Support at 1-888-377-4575, if you have any difficulty installing this Patch. Sites outside of the United States, please contact your local Esri software distributor.