North Is Not Where It Was When You Were Born

Your compass is not broken. The place it points to has been walking away from Canada since before you were born.

This article contains affiliate links. If you buy through them, we may earn a small commission at no extra cost to you.

Pick up a hiking compass and the needle swings, wobbles, and settles. It looks like the most dependable reading in the world. It is not. That needle is pointing at a spot in the Arctic that has been sliding across the top of the planet for as long as anyone has measured it, and it has probably moved hundreds of kilometres since the day you were born, possibly more than a thousand. Nothing is wrong with the compass. The target moved.

The needle does not point at the top of the map. It points at magnetic north, and the gap between the two is called declination. Depending on where you stand, that gap can be almost nothing or it can be tens of degrees, which is why paper maps print a little correction note in the corner and why serious hikers learn to adjust for it before they trust a bearing.

Your phone does the same correction, quietly, every time it draws that blue direction cone on a map. It uses the World Magnetic Model, a global chart of the field maintained by the British Geological Survey and the American agency NOAA. The model is rebuilt roughly every five years because the thing it describes will not sit still, and the current version is intended to serve until around 2030.

That is the strange part. The invisible field is not a fixed backdrop. It is more like weather, and if you want to see it behave rather than take it on faith, a sheet of magnetic viewing film held over any ordinary fridge magnet will show you the same looping field lines that wrap the whole planet, just very much smaller.

Geographic north, the one on globes and maps, is a fixed point at 90 degrees north where the planet's spin axis meets the surface. It has been in the same place your entire life and everyone else's.

Magnetic north is a different animal. It is the place your compass answers to, and it is produced by molten iron churning in Earth's outer core rather than by anything on the surface. A bottle of ferrofluid on a desk is a crude toy version of the same idea, iron particles in liquid arranging themselves into ridges the instant a field touches them, then collapsing again the moment it moves. It has been known to wander since it was first properly measured in the Canadian Arctic in 1831, and it has been drifting away from Canada ever since.

Specialists actually recognise a third one, geomagnetic north, which is a simplified average used for modelling. But for anyone holding a compass, only two matter, and they are not in the same spot and never have been. One of them is a matter of geometry. The other is a matter of what the iron under your feet happened to be doing this decade.

Since the 1830s, magnetic north has travelled more than 2,000 kilometres, out of the Canadian Arctic and towards Siberia. That is further than New York to Houston, covered by a spot on the map that nobody pushed.

For most of the last four hundred years it moved at a fairly sleepy pace, typically around 10 kilometres a year or less, according to William Brown of the British Geological Survey. Then, around 1990, it stopped ambling. The drift accelerated from roughly 15 kilometres a year to somewhere in the range of 50 to 60, which Arnaud Chulliat of NOAA has described as unprecedented as far as the records we have go. Around 2015 it eased off again to roughly 35 kilometres a year, and NOAA's most recent annual report put the average at about 36 kilometres a year, against only about 9 for the magnetic south pole.

Measure between the recorded positions instead of averaging the speeds, and the twenty year figure comes out at roughly 1,000 kilometres in a straight line, comparing the estimated 2005 position with the one NOAA published for 2025. That is approximately London to Berlin. If you are in your forties or older, magnetic north has moved further in your lifetime than most people will ever drive in one go, and you felt nothing, saw nothing, and were told nothing.

It has also been closer to the top of the world than you might expect. The European Space Agency reported that in late October 2017 the pole crossed the International Date Line and passed within about 390 kilometres of the geographic pole, which is a little further than London to Paris. Then it did something almost nobody noticed. It turned. By NOAA's 2025 position that gap had opened back up to roughly 470 kilometres, which means the pole came close to the top of the world and is now walking away from it.

Here is the part that proves it is real, because it cost somebody money.

The number painted on a runway is not a name. It is a compass heading rounded to the nearest ten degrees, which means it is tied to magnetic north, which means it goes out of date when magnetic north moves. In January 2011, Tampa International Airport in Florida closed its busiest runway for over a week and repainted it. What had been 18R/36L became 19R/1L. According to the National Business Aviation Association, more than 140 signs and panels had to be changed along with the paint, and two more runways at the same airport were altered later that month.

Tampa was not a one off. The same association notes that Palm Beach International made the same correction in 2009 and Miami International fixed its north runway numbering when it was rebuilt in 2003. Airports renumber periodically, and it is treated as routine maintenance rather than news.

Think about what that means. A change in the flow of liquid metal thousands of kilometres beneath the Atlantic ended up as a work order for a paint crew in Florida. No headline, no drama, just a runway closed for a fortnight and a slightly different number on the tarmac.

For years the acceleration had no accepted explanation. Then in 2020, a team led by Phil Livermore at the University of Leeds published a study in Nature Geoscience using two decades of satellite data, including from the European Space Agency's Swarm mission.

Their answer is a tug of war. There appear to be two large patches of magnetic flux sitting at the boundary between the core and the mantle, one under Canada and one under Siberia, and the position of magnetic north is largely decided by which patch is pulling harder. Livermore's team concluded that changes in the flow of the core between roughly 1970 and 1999 stretched the Canadian patch out and weakened its grip at the surface. Siberia started winning, and the pole set off across the Arctic.

It helps to picture what is actually doing the pulling. It is not a bar magnet buried in the middle of the Earth. It is iron hot enough to flow, circulating in the outer core, and the field is a by product of that motion. Nothing about it is anchored to anything you could point at.

The obvious story here is a runaway pole, and that story is wrong.

Magnetic north did something no record had shown before. It sped up to several times its long term pace over about fifteen years. Then, without anyone predicting it, it slowed down again. Two remarkable things happened, and the honest position is that neither was forecast in advance.

Livermore's own view, given after the 2020 paper, was that the models suggest the pole will keep heading towards Siberia for the next few decades, but that because its position depends on such a delicate balance between the two patches, only a small adjustment inside the core would be needed to send it back towards Canada. His team's models put the likely travel over the coming decade at somewhere between about 390 and 660 kilometres, which is roughly the gap between Boston to Philadelphia at the low end and Boston to Washington at the high end.

So the field is not collapsing and the sky is not falling. Something quieter is true instead, and it is arguably stranger. The single most basic direction a human being can name, the one every globe and every migrating bird and every runway in the world is built around, is set by a substance nobody has ever seen, moving in a way nobody can predict, and it has never once stayed where we left it.

Your compass will still get you home. It just will not agree with the compass your grandparents used, and it will not agree with the one your grandchildren use either.

• NOAA National Centers for Environmental Information, 2025 WMM Annual Report is Released
• NOAA NCEI, Wandering of the Geomagnetic Poles
• CNN, Earth's magnetic north pole is on the move, and scientists just updated its position
• European Space Agency, Tug-of-war drives magnetic north sprint
• European Space Agency, Magnetic north and the elongating blob
• University of Leeds, Tug-of-war drives magnetic north sprint
• Live Science, The north magnetic pole is leaving Canada for Siberia. These 'blobs' may be the reason why
• EarthSky, Why is Earth's magnetic north pole drifting so rapidly
• National Business Aviation Association, How Changes in Magnetic North Are Impacting Airports
• Live Science, Earth's Magnetic Field Shifts, Forcing Airport Runway Change
• Phys.org, Tampa airport runways renumbered due to magnetic north movement
• IFLScience, Earth's Magnetic North Pole Officially Has A New Position