Geographic Magnetic Calculator

The Geographic Magnetic Calculator is a tool to help you determine UTM Coordinates and the Magnetic Declination that correspond to a longitude/latitude location. GeoMag is freeware and can be downloaded for your personal use and can only be distributed as a stand alone application. Now updated for the lastest geomagnetic epoch parameters, 2005 through 2010.

GeoMag has date entry boxes with up/down arrows that allow the user to change the location and time for which the Earth's magnetic declination is calculated. When the longitude or latitude change, GeoMag automatically translates the location to UTM easting, northing, zone number and convergence. In reverse, when changes occur in the UTM easting, northing or zone, GeoMag automatically translates the longitude and latitude. In both case, the Earth's magnetic declination is updated.

GeoMag has two drop down boxes for selecting continents and the geographic Datum. For all USGS topographical maps, the default Datum is the NAD CONUS 1927. The newer WGS 84 datum can be selected, or 18 other datums. All units are either kilometers/meters and degrees/decimal minutes of angle.

Clicking the mouse on the map will set the location, calculate the UTM coordinates and magnetic declination. If the mouse is dragged across the map, the data fields are updated with the moving position. In both cases, the Bearing compass graphically displays the magnetic declination.

The program can also calculate the magnetic declination for any location in the period from 1600 to the year 2005. The altitude can also be varied, but its effect is small for positions physically on the surface of the Earth. Currently displayed values can be saved to a text file.

Links to other Geographic and Magnetic pages:

Links to other pages at this site:

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