There can also be a problem with knowing which end is north. Get it wrong and the compass can send you in the opposite direction to where you want to go. The time you need a compass most is when you can't calibrate it from landmarks or the stars etc.

If you use a battery and coil, then it is determined by the polarity of the battery and the handedness of the coiling, but I wouldn't be able to remember the theory with enough confidence to rely on the direction.

If you create the compass by stroking the needle with another magnet, then you need to know which end is north of your existing magnet, which if it's, eg the headphone magnet from the example he gives, you probably won't know. And then it makes a difference which direction you stroke in.

If you are able to use the Earth's magnetic field to create a compass, then you need to know which way is north in that, too.

If you carry a sewing kit, then it's a good idea to magnetise the needles in advance, and you should probably make sure you make the pointy end north and remember that you've done it.
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