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3 articles · All tags

• Reading Topographic Maps and Using a Compass
  How contour lines encode terrain, how to orient a map, take a bearing, and find your position — the durable skill set behind every navigation app.
• How GPS Works
  How a receiver on Earth calculates position from satellite signals — trilateration, atomic clocks, and the relativistic corrections that keep the system honest.
• The Gyroscope
  Why a spinning wheel resists being turned — angular momentum, precession, and the sensors that guide everything from bicycles to spacecraft.