2. Compass - Wikipedia
Link: https://en.wikipedia.org/wiki/Compass
Description: A gyrocompass is similar to a gyroscope.It is a non-magnetic compass that finds true north by using an (electrically powered) fast-spinning wheel and friction forces in order to exploit the rotation of the Earth. Gyrocompasses are widely used on ships.They have two main advantages over magnetic compasses: they find true north, i.e., the direction of Earth's rotational axis, as …