Magnetic Calculators

Magnetic declination calculator

This calculator may be used to calculate the magnetic declination for a specified location and date based on the International Geomagnetic Reference Field model.

Magnetic field calculator

This calculator may be used to calculate values of all seven magnetic components (D, I, H, Z, F, X, Y) for a specified location and date based on the International Geomagnetic Reference Field model.

Web service and Batch Processing

Please contact Geomag-Info for information on the magnetic calculator web service and batch processing.

Coordinates

If you do not know your latitude and longitude consult one of the following sites:

If you know the Universal Transverse Mercator (UTM) coordinates for your location, you can convert them into Geographic coordinates (latitude, longitude) by consulting the following website:

http://webapp.geod.nrcan.gc.ca/geod/tools-outils/trx.php

Geomagnetic reference field

The International Geomagnetic Reference Field model is used to compute values within Canada and elsewhere in the world and it is provided with a disclaimer. The relatively small differences between the model values and the true values of the magnetic field at a given location are dependent on a number of factors:

  • The accuracy of the model will worsen at locations close to the magnetic poles.
  • As the time from the epoch of the model increases, uncertainties in the estimate of secular variation will result in an increasingly large difference.
  • Magnetic minerals in local geological formations cause magnetic anomalies that can sometimes be very large. These cannot be reproduced by reference field models.
  • Large magnetic storms can temporarily cause large changes in the magnetic field, especially at high latitudes.