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An inertial navigation system (INS) is a navigation device that uses a computer, motion sensors and rotation sensors (gyroscopes) to continuously calculate by dead reckoning the position, the orientation, and the velocity of a moving object without the need for external references. Often the inertial sensors are supplemented by a barometric altimeter and occasionally by magnetic sensors and/or speed measuring devices. More advenced ones are known under the name of IRS for Inertial Reference System.

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