How to Re-Polarise Your Compass
How to Re-Polarise a Compass: A Quick Guide
A reliable compass is a walker’s best friend—especially when the fog comes down or phone batteries die miles from civilization. But what happens when your compass needle points the wrong way? You might need to re-polarise it.
Here's a simple guide to understanding, diagnosing, and fixing compass polarity problems—so you're never off-course for long.
🧭 What Does “Re-Polarising” a Compass Mean?
The needle of a magnetic compass aligns with Earth's magnetic field because it’s magnetised—with a north-seeking end (usually red). Over time strong magnetic fields (from electronics (such as your phone) or magnets), or improper storage can weaken or even reverse the needle’s polarity.
Re-polarising a compass means restoring the correct magnetic orientation to the needle, so it reliably points north again.
🛠️ Signs Your Compass Needs Re-Polarising
- The red (north) end of the needle points south.
- The needle sticks or doesn’t settle properly.
- You’ve recently exposed the compass to strong magnets or electrical currents.
- Your compass contradicts other reliable compasses or GPS.
⚙️ What You’ll Need
- A strong bar magnet (or a neodymium magnet)
- A steady surface
- A basic understanding of compass orientation
Tip: Do this outside or away from metal objects and electronics, which can interfere with magnetic fields.
🔄 How to Re-Polarise Your Compass
Step 1:
Confirm the problem by checking the compass reading against another compass or known direction. Make sure it's not just local interference.
Step 2:
Place the compass on a flat, stable surface.
Step 3:
Take your bar magnet and gently stroke it along the needle from the end you want to become north (typically the red end) toward the other end. Always stroke in one direction, not back and forth.
Do this 10–20 times, applying firm but controlled motion.
See a video tutorial here.
Step 4:
Time to test it! Place the compass flat and steady. Let the needle settle. If it now points north correctly, you're done!
Step 5:
If it’s still off, repeat the stroking process. Some compasses need a bit more coaxing.
🧼 Bonus Tip: Compass Care to Prevent Future Issues
- Store it away from electronics and magnets.
- Don’t leave it in direct sunlight or extreme heat.
- Keep it clean and dry.
- Don’t bang or drop it.
🏞️ Final Thought
A compass is more than just gear—it’s your backup guide when technology fails. With a little care and know-how, you can keep it accurate for years of adventures. If yours still isn’t working after re-polarising, it might be time to invest in a new one—check out our range of compasses here.