Among other industries, inertial navigation systems (INS) are used to help navigate many types of vehicle (land, sea and air). They are different to navigation systems used by the general public, i.e.

Inertial navigation systems use information provided by accelerometers and gyroscopes to provide the position and orientation of an object relative to a predetermined origin point, orientation and ...

No audio available for this content. A U.S. Secretary of Defense once predicted that navigation would eventually be based on inertial devices that were set at the factory, and then always knew where ...