World Magnetic Model 2010 Calculator

Use the tool below to compute values for the geomagnetic field and secular variation for a given set of coordinates and date.

Choose the geodetic latitude and longitude either by entering the coordinates into the form below (decimal degrees may be entered into the 'degrees' field), or by simply clicking the location on the map. The altitude and date may be set using the appropriate form fields.

Clicking on the 'Show results on map' button will display the values for the chosen coordinates in a pop-up window. These results may be saved by clicking on the 'Save' button, allowing you to compare values from a number of locations.