
Every five years the IAGA releases a new set of coefficients that are used to calculate the magnetic declination, field strength and magnetic directional vectors for any given time and place on the planet for the next five years.
They are released on years divisible by 5, so this is one of those years. Winserve Survey & Winsurv3D have both been updated for the 2005-2010 geomagnetic calculation used to determine magnetic declination. Both programs support IGRF and WWM models.
The files can be downloaded from the support area. Note that in order to use these new files you must have the latest version of PDT software installed. More information on the changes can be had at http://www.ngdc.noaa.gov/IAGA/vmod/home.html concerning the changes to the model. |