On Thu, Apr 11, 2019 at 11:08:26PM +0100, Olly Betts wrote:
On Thu, Apr 11, 2019 at 06:03:39PM +0200, Martin Budaj via Therion wrote:
On Thu, Apr 11, 2019 at 5:05 PM kevin dixon via Therion <therion@speleo.sk> wrote:
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.
Shortly after WMM2015v2 was released I did some comparisons for Northerly locations on land between WMM2015v2 and IGRF12 for dates at the end of this year (since IGRF13 is due out in December 2019) and the largest difference I found was 0.1° which is probably acceptable given the accuracy of the readings involved (and considering this is only an issue until this December anyway).
When will this update appear in Survex and Therion ?
My current plan for Survex is to address this by updating to IGRF13 in December 2019.
I've now pushed the changes to the Survex git repo to update to IGRF13, and they'll be in Survex 1.2.43, hopefully fairly soon (ideally I'd like to fix a bug with SVG export first). I see Martin B. updated therion's git repo last month, so the next therion release should also support IGRF13. Cheers, Olly