Gyro horizon and Navigational instrument

Gyro horizon noun - A navigational instrument based on a gyroscope; it artificially provides a simulated horizon for the pilot.

Navigational instrument and gyro horizon are semantically related. In some cases you can use "Navigational instrument" instead a noun phrase "Gyro horizon".

Navigational instrument noun - An instrument used for navigating.

Gyro horizon and navigational instrument are semantically related. Sometimes you can replace phrase "Gyro horizon" with "Navigational instrument", this phrases are similar.