Flight indicator and Navigational instrument

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

Navigational instrument and flight indicator are semantically related. In some cases you can use "Navigational instrument" instead a noun phrase "Flight indicator".

Navigational instrument noun - An instrument used for navigating.

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