|Global map showing declination from the World Magnetic Model at 2015.0|
For the past 350 years in the UK and Ireland declination has been westerly (magnetic north west of true north) and the agonic line has been advancing from the east. In 2017 the agonic line arrived at East Anglia and Kent and is due to pass slowly over the British Isles during the next few years with declination becoming easterly behind it. Susan Macmillan of the Geomagnetism Team explains a little more.
|Magnetic declination at mid-2017|
What is causing this gradual change in direction of magnetic north?
What does this mean for compass users in the British Isles?
|Magnetic declination at the four observatories in the UK and Ireland|