[Therion] World Magnetic Model

[kevin dixon]

The last Therion release 5.4.3 is dated 01 Feb 2019.

There has in recent years been a significant change of the Magnetic North
Pole location, less so for the Geomagnetic South Pole:
https://ngdc.noaa.gov/geomag/GeomagneticPoles.shtml

Given the above, an out of cycle World Geomagnetic Model WMM2015v2 was
released 04 Feb 2019.

When will this update appear in Survex and Therion ?

Thanks,

Kevin Dixon
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