Tähekompassi kasutatakse teatud olukordades, kus magnetkompassid ja gürokompassid on ebausaldusväärsed. Kõige ilmsem on see polaarpiirkondades, kus magnetkompassi nõelale avaldatav jõud on peaaegu vertikaalne ja gürokompassid muutuvad Maa pöörlemise tõttu ebastabiilseks.
Astrocompasses to use in certain circumstances when magnetic compasses and gyrocompasses are unreliable. The most obvious is in polar regions, where the force exerted on the needle of a magnetic compass is nearly vertical and gyrocompasses become unstable due to the rotation of the Earth.
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