Your iPhone's compass is a feature you may not know about, but it can save your life. However, you'll need to calibrate it ...

Earth’s magnetic north is not static. Like an anchorless buoy pushed by ocean waves, the magnetic field is constantly on the move as liquid iron sloshes around in the planet’s outer core.

Turn your body (not just the compass) so the magnetic needle is contained within the orienting arrow. Voilá! You're now facing north. If you want to face east instead, turn the housing so the E ...

The needle will turn and then come to a complete stop. It will be facing magnetic north. You can check this by placing the compass next to the bowl. The needle is being affected by the Earth’s ...