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Instructions for the IGRF+ Declination Calculator

Values are computed using the current International Geomagnetic Reference Field as adopted by the International Association of Geomagnetism and Aeronomy. Values are estimates based on the IGRF11 and are generally accurate to within 30 minutes of arc for D and I and 100-250 nT for the force elements (F, H, Z, X, and Y).

Input required is:

  1. Location (latitude and longitude), entered in decimal degrees.
    note: If you do not know your latitude and longitude and you live in the United States, enter your location in the box provided and use the "Go" button.
  2. Elevation (recommended for aircraft and satellite use) in feet, meters, or kilometers above WGS-84 reference ellipsoid. Elevation values are valid down to -10 km. Use the radio button to choose an appropriate unit.
  3. Date in Year, Month, Day (form defaults to the current day).
  4. To compute your field values, hit the Compute! button. The calculator will also compute values upon hitting the Go button.


Last modified: Wednesday, 12-Feb-2013 10:22:11 MST