Changes

Gyroscopes played an important part in creating the gyrocompass, a compass that finds ''true'' north (the direction of Earth's rotational axis) and is not negatively influenced by ferrous metal in the ship's hull.

Gyroscopes played an important part in creating the gyrocompass, a compass that finds ''true'' north (the direction of Earth's rotational axis) and is not negatively influenced by ferrous metal in the ship's hull.

They are also used for [[inertial navigation system]]s,<ref>Honeywell Commercial Aviation Products: [http://www.honeywell.com/sites/servlet/com.merx.npoint.servlets.DocumentServlet?docid=D1A8786B5-5658-438B-AB93-7B37E787F29A GPS Align in Motion of Civilian Strapdown INS]</ref> which in turn are used in [[ballistic missile | ballistic missiles]].

Gyroscopes were originally used to provide attitude reference points for [[inertial navigation system]]. However modern INS will more typically use a [[laser gyroscope]], which, despite it's name, does not use gyroscopic principles at all.

==References==

==References==