How does inertial guidance work?
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When you ride in a car, you feel it speed up and slow down, as well as turn. From this information, you can figure out where the car is even if your eyes are closed. You can even try to give the driver navigation instructions based off of this alone.
That is inertial guidance.
Computers can get pretty precise with it. Certainly better than you from the back seat of a car. Between gyroscopes and accelerometers, a microchip can figure out approximately how much it has moved from its current location.
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