
1) Aircraft instrument 2) Compass 3) Navigation device
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https://www.crosswordclues.com/clue/gyrocompass

1) Gyro 2) Gyrostatic compass
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https://www.crosswordclues.com/clue/gyrocompass

== History == The first, not yet practical, form of gyrocompass was patented in 1885 by Marinus Gerardus van den Bos. Usable gyrocompass was invented in 1906 in Germany by Hermann Anschütz-Kaempfe, and after successful tests in 1908 became widely used in German Imperial Navy. The gyrocompass was an important invention for nautical navigation beca...
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http://en.wikipedia.org/wiki/Gyrocompass

(from the article `navigation`) The direction a gyrocompass points is independent of the magnetic field of the Earth and depends upon the properties of the gyroscope and upon the ... Gyroscopes are also employed in a type of nonmagnetic compass called the gyrocompass. The gyroscope is mounted in three sets of concentric rings ... ......
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http://www.britannica.com/eb/a-z/g/86

[
n] - a compass that does not depend on magnetism but uses a gyroscope instead
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http://www.webdictionary.co.uk/definition.php?query=gyrocompass

gyrocompass; gyrostatic compass 1. A compass that contains a gyroscope which is kept level so that it orients itself with 'true north'. 2. A north-seeking form of gyroscope used as a directional reference in navigation. 3. A navigational compass containing a gyroscope rotor, that, when adjusted for the latitude and speed of the vessel or aircraft...
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http://www.wordinfo.info/words/index/info/view_unit/946/
noun a compass that does not depend on magnetism but uses a gyroscope instead
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https://www.encyclo.co.uk/local/20974

a navigational compass containing a gyroscope rotor, that, when adjusted for the latitude and speed of the vessel or aircraft, indicates the direction of true north along the surface of the earth or communicates this information to one or more gyro repeaters. Also called
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https://www.infoplease.com/dictionary/gyrocompass
No exact match found.