What is another word for inertial guidance system?
Pronunciation: [ɪnˈɜːʃə͡l ɡˈa͡ɪdəns sˈɪstəm] (IPA) 
An inertial guidance system is a mechanism used to determine the position, orientation and velocity of a moving object. There are several synonyms for this term, including inertial navigation system, inertial measurement unit, and strapdown inertial navigation system. The basic principle behind an inertial guidance system is the use of accelerometers, gyroscopes, and computer algorithms to track the vehicle's motion, calculate its position and orientation, and make necessary adjustments. It is widely used in airplanes, spacecraft, and submarines as a backup navigation system to GPS, as it can operate independently of external sources. While various terms are used to describe the technology, all refer to the same fundamental concept of a self-contained system for autonomous navigation and position determination.
