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Inertial navigation, which is based on inertial guidance, is a self-contained system, wholly independent of either visual or electronic information from outside the craft in which it is operating. This system consists of a certain type of accelerometer, stabilized by gyroscopes that register the magnitude of the acceleration of the craft in both a north-south and an east-west direction from a known starting point; the accelerations are converted by computers into a precise position for the craft.
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