Designed to compensate for the weaknesses of the magnetic compass, the Earth inductor compass provided pilots with a more stable and reliable reference instrument. They were used in the Douglas World Cruisers in 1924 during the Around-the-World flight by the U.S. Army Air Corps.
To address the magnetic compass's weaknesses, the Earth inductor compass served as an improved reference instrument for pilots. It was used in the Douglas World Cruisers during the U.S. Army Air Corps' around-the-world flight in 1924.