Experts from REI do a great job of explaining the basic parts of a compass and how to use them, but here is the breakdown: ...

Then use a ruler to draw a line joining the points. STEP 2: Put the pin of the compass at the point of the angle. Set the other end of the compass to a point most of the way up one of the lines ...

Uranus and Neptune have magnetic fields that are both multipolar and tilted at extreme angles relative to their rotation, so a compass needle on either of these ice giants would act erratically ...