A device used to determine geographic direction, usually consisting of a magnetic needle or needles horizontally mounted or suspended and free to pivot until aligned with the magnetic field of Earth. 指南針用於確定地理方向的設備,通常包括一個或多個水平安裝或懸挂的磁針,可在樞軸上自由活動直到與地球磁場在一條線上