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