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astrocompass
astrocompass n.
Brit. 
/ˈastrəʊˌkʌmpəs/
, /ˈastrəʊˌkʌmpəs/U.S. /ˈæstroʊˌkəmpəs/
chiefly Aeronautics an instrument used to determine the direction of true north by reference to the stars.An astrocompass is chiefly used for correcting the errors of magnetic and gyroscopic compasses and as a substitute for these when they cannot be used, such as in polar regions./ˈæstroʊˌkəmpəs/ΘΚΠ
society > travel > travel by water > vessel, ship, or boat > equipment of vessel > navigational aids > [noun] > compass > types of
paradoxal compass1558
steering compass1669
variation compass1669
correcting compass1821
telltale1828
pelorus1854
liquid compass1865
gyroscope-compass1909
gyro-compass1910
radio compass1912
gyro1914
gyroscopic compass1920
inductor compass1922
gyro-pilot1923
induction compass1925
astrocompass1942
flux gate compass1946
1942 Tee Emm (Air Ministry) 2 56 The navigator can prove to himself that the astro-compass wasn't included in the equipment just for fun.
1971 Times 14 Oct. 17/7 The aircraft was fitted only with a Sperry Compass System, which for the North Pole can only be used as a basic direction indicator and an ordinary astro-compass.
2009 Daily Tel. 21 Apr. 29/2 Schofield had to rely on gyromagnetic and astro compasses.
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