Heath Harmon has experience in construction work across the western United States. An experienced outdoorsman, Heath Harmon takes part in activities such as hiking and camping. One key skill for finding one’s way through a wilderness setting without an electronic device is using the compass.
The compass is an ancient navigational tool constructed of a circular dial with printed directions, a housing, and a needle. The latter is made of metal-like steel that can hold a magnetic charge for an extended period. The needle both detects and responds to magnetic fields that surround the earth.
The planet has an iron core that reflects gravitational pressure and is a combination of solid-crystal inner core and liquid outer core. Movements within the outer core are thought to generate the Earth’s magnetic field, which takes form of the north and south poles. The magnetic poles actually vary slightly from the planet’s axis of rotation, which is used in defining the geographic poles.
The magnetic North Pole thus shifts over time as the Earth’s magnetic field itself changes direction. In September 2019, compasses at Greenwich pointed directly at true north, a phenomenon that had not been observed for 360 years. That said, the two values are close enough that the compass has been an essential navigational aid throughout the centuries.
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