Compass - Wikipedia
https://en.wikipedia.org/wiki/Compass
OverviewHistoryDesignVariantsConstructionUseNon-magnetic compassesSee alsoA compass is a device that shows the cardinal directions used for navigation and geographic orientation. It commonly consists of a magnetized needle or other element, such as a compass card or compass rose, which can pivot to align itself with magnetic north. Other methods may be used, including gyroscopes, magnetometers, and GPS receivers.
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