A compass is a device used for navigating by the means of a magnetic needle.
Jonathan Archer gave his first officer T'Pol an antique compass from the early 20th century, as a present, for her first official day of duty aboard Enterprise in 2154. Upon giving it to T'Pol, Archer told her that it "should help keep [her] pointed in the right direction." (ENT: "Borderland")
One of the easiest ways to construct a compass was to place a magnetized piece of metal in a solution so that it floated. Miles O'Brien created a primitive compass with this method while marooned with Benjamin Sisko on a planet in the Orellius system. (DS9: "Paradise")
An improvised compass.
An early 20th century compass.
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