Magnetic Declination vs Date

[Caput_58]

Is magnetic variation over time being modeled currently?  I've located a few historical charts from the the 70's, and even with the date set appropriately, the magnetic headings are 7 degrees off.

[buur]

it seems that the magnetic declination used by ED is off from the real world declination. And no one knows with model ED is using.

You can check your charts with this website to see if the charts are correct. https://www.ngdc.noaa.gov/geomag/calculators/magcalc.shtml

 

[Caput_58]

After a little more study I found the files DCS uses.  They have files at 5 year increments from 2025 to 1985.  Presumably they are interpolating.  And presumably it all falls apart when extrapolated to 1972.  I'm trying to understand the files now to see if additional years could be added.

[Minsky]

 

[buur]

vor 12 Stunden schrieb Caput_58:

After a little more study I found the files DCS uses.  They have files at 5 year increments from 2025 to 1985.  Presumably they are interpolating.  And presumably it all falls apart when extrapolated to 1972.  I'm trying to understand the files now to see if additional years could be added.

You find these files also on the NOAA site and also some explanations how to compute them.