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Answer for the clue "Direction indicator of the earth's magnetic field ", 8 letters:
fluxgate

Word definitions for fluxgate in dictionaries

Wiktionary Word definitions in Wiktionary
n. (context physics English) Any of several devices that use soft iron cores surrounded by coils of wire that generate a pattern of induced currents when it moves relative to an external magnetic field

Usage examples of fluxgate.

In the nose of the flying eye there was contained a small detector element called a fluxgate, kept parallel to the magnetic field of the earth by a gyro mechanism.