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: Magnetic declination is the angle between magnetic north and true north ...

The difference between True North (toward the North Pole, and usually the top of a map) and Magnetic North (where the compass needle points) is known as declination. It varies depending on your ...

Magnetotactic bacteria synthesize magnetic iron nanominerals, which function as tiny compasses that allow the microbes to navigate using Earth's geomagnetic field. Earth's iron cycle is a very ...