the compass's magnetic inside has an attraction to directions where to go which then helps you to find your way round to places much easier
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Heaven help the 11 who found that lot useful! To answer seriously, a compass is vital whenever you need to know directions relative to North & South: navigation, some types of surveying etc.
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Hold it in your hand. Watch the arrow and walk in that direction. If you're headed for a wall, you're right, just keep going.
Compass compass compass
Compass
A geometric compass is an instrument, or a tool, used in plane geometry to draw arcs and circles. Not to be confused with the geometric and military compass invented by Galileo.
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By bisecting a 15 degree angle with a straight edge and a compass.