an interesting bean 
TAke a look y’all https://www.ngdc.noaa.gov/geomag/calculators/mobileDeclination.shtml
Government websites are all one of two types. Either they’re a dumpster fire that people are forced to use or they offer information extremely well but no one ever goes to them
The smartphone app is even cooler, you can track the magnetic conditions around you while you go for a hike, or in flight, and submit them to the NOAA so the feds can keep tabs on all the magnetism freaks.
They call the data “magtivities”
Corsair of Mastodon@timmy honestly NOAA is one of the best government websites, I use them a lot for sailing
@whiskeysailor they have a chart of magnetic declination for the world where you can move a slider to shift the year between 1600 and today. I’m not sure why I’d need it, but it’s there.
@timmy they also have free nautical charts of the USA in pdf which are actually really useful