GEOMAGIX uses numerical models of the earth's magnetic field derived from measurements taken by the USGS, the British Geological Survey and other world and government organizations. Each model is stored in an ASCII file with the extension .COF. File names indicate the source and/or region and year of validity. Most models are valid for 5 years from their date, except for the BGS historical models which are valid for 50, 40 or 20 years.
Allows you to name each location. This name will be used as the file name, so it should not contain any characters illegal in file names,
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