Understanding Declination: Why Your Compass Doesn’t Actually Point North

If you look at your compass, it’s not pointing directly at the North Pole. Instead, the magnetized needle is showing you the direction of magnetic north. Right now, magnetic north and true north (the geographic North Pole) are relatively close to each other, but they’re slowly drifting apart.

THE WANDERING MAGNETIC NORTH

That’s because magnetic north is always moving. As Earth’s molten core moves, it affects the magnetosphere, the magnetic field that helps protect the planet from solar radiation. When the north magnetic pole was first discovered in 1831, it was pinpointed in Canada about 1,000 miles south of the true North Pole. Over the last century, it’s been migrating across the Arctic Ocean toward Russia, sometimes moving more than 30 miles per year. Scientists track its position regularly to keep navigation tools accurate.

DECLINATION — THE DIFFERENCE BETWEEN NORTHS

If you’re hiking, backpacking or orienteering, this shifting magnetic pole means you can’t rely on your compass alone. You have to account for declination — the angle between true north and magnetic north.

Declination varies depending on where you are in the world. In some places, it’s only a degree or two. In others, like parts of Alaska, it can be 20 degrees or more. That’s a big difference — if you don’t correct for it, you could end up miles off course.

HOW TO CORRECT FOR DECLINATION

• Check your map: Always use a current orienteering or topographic map that shows declination. These maps often have both true north and magnetic north lines printed.

• Adjust your compass: Some compasses come with declination adjustments on them. You simply turn a small screw or dial to set your location’s declination, and the compass automatically compensates for it.

• Do it manually: If your compass doesn’t have this feature, you’ll need to add or subtract the declination from your compass reading, based on your location.

• Keep it updated: Because magnetic north keeps moving, the declination for your area can change over time. Make sure you have an updated map.

WHY IT MATTERS

For short trips in familiar terrain, a small declination error might not cause much trouble. But for longer treks and backcountry travel, even a few degrees off can send you far from your target. In wilderness navigation, accuracy can mean the difference between arriving at your campsite or getting lost entirely.

So next time you pull out your compass, remember: the needle doesn’t lie — but it also doesn’t point exactly where you might think. A quick declination check keeps your adventure on the right path.