定向式指南針的結構
1. 磁針Compass Needle 2. 定向箭咀Orienting Arrow 3. 轉盤北標記North of Dial 4. 轉盤Compass Housing 5. 定向線Orienting Line 6. 方位角度數Azimuth Bearing Reading 7. 底板Base Plate 8. 放大鏡Magnifying Lens 9. 前進箭咀Direction of Travel Arrow 10. 輔助線Aid Line 11. 公制尺Metric Scale 12. 度數指示線Bearing Indicate Line 13. 方格座標量度尺Romer for Grid Reference
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