The navigational instrument, which Ganitch called the GPS of its day, cost $150 in 1942.
From the sfgate.com
The article says that a compass is a navigational instrument.
From the en.wikipedia.org
A compass is a navigational instrument that measures directions in a frame of reference that is stationary relative to the surface of the earth.
From the en.wikipedia.org
The armillary sphere was an important astronomical and navigational instrument for the Portuguese sailors who ventured into unknown seas, during the Age of Discoveries.
From the en.wikipedia.org
Other duties include testing instruments and navigational controls, reading technical diagrams and manuals to locate and repair instrument parts, and replacing equipment parts.