NOAA Historical Declination Viewer An interactive map showing historical magnetic variation (the angle between true north and the direction a magnetic compass will point) since 1590. The movement of the north magnetic pole has accelerated in recent years. Since 1963,...
Posted by Michael Bates on March 15, 2019 9:13 AM
If you use an RSS reader, you can subscribe to a feed of all future entries tagged 'navigation'. [What is this?]