Hi,

Therion does not use WMM at all (as it doesn't contain 20th century historical data).
It uses IGRF model (https://www.ngdc.noaa.gov/IAGA/vmod/igrf.html) which hasn't been updated yet.

Best regards
Martin

On Thu, Apr 11, 2019 at 5:05 PM kevin dixon via Therion <therion@speleo.sk> wrote:
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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