Grid of Magnetic Field Estimated Values More information

Compute the estimated values of Earth's magnetic field, including magnetic declination (D), based on the current World Magnetic Model (WMM) or the International Geomagnetic Reference Field (IGRF) model. For 1590 to 1900 the calculator is based on the gufm1 model. A smooth transition from gufm1 to IGRF was imposed from 1890 to 1900. The calculator provides an easy way for you to get results in XML, CSV, or JSON programmatically (API). Registration is required to access this service. Please register using the API registration link on the top right.

Calculate Magnetic Field Component Grid
Southern most lat: S N
Northern most lat: S N
Lat Step Size:
Western most long: W E
Eastern most long: W E
Lon Step Size:
Elevation: GPS Mean sea level
Magnetic component:
Start Date:
Year Month Day
End Date:
Year Month Day
Step size:
Result format: XML CSV JSON
  
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Location: ± Degrees