##### Inertial Navigation System (INS) An inertial navigation system is a [[navigation]] device that uses motion sensors ([[Accelerometer]]), [[rotation]] [[sensors]] ([[gyroscopes]]) and a [[computer]] to continuously calculate by [[dead reckoning]] the [[position]], the [[orientation]], and the [[velocity]] (direction and speed of movement) of a moving object without the need for external references. Often the inertial sensors are supplemented by a [[pressure altimeters|barometric altimeter]]  and sometimes by [[magnetic]] sensors ([[magnetometers]]) and/or speed measuring devices. Other terms used to refer to inertial navigation systems or closely related devices include inertial guidance system, inertial reference unit, inertial instrument, inertial measurement unit (IMU) and many other variations. >Covered in: >Mentioned in: >References: [[WP INS|🌍]] [[The Genius of Inertial Navigation Systems|🎞️]] >Required by: > >Related to: >[[The Difference Between IMU, AHRS and INS|🎞️]]