The operation of a magnetic compass is a basic principle that's been in use to facilitate travel and trade for about a thousand years. Here's a simple magnetic compass definition according to the Encyclopedia Britannica: "An instrument for determining direction on the surface of Earth by means of a magnetic pointer that aligns itself with Earth's magnetic field." The basic principle behind this enduring technology has stood the test of time, and is still required in many cases even when sophisticated satellite-based navigation is available. Using a magnetic compass connects you with the world on foot, by ship, in the air, and by many other means that dates back centuries and covers the globe. What is a magnetic compass and how does it work? The Basic Concepts of All Magnetic Compasses
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