| 11. | This was supplanted in the early 20th century by the liquid-filled magnetic compass.
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| 12. | They dealt with the accuracy of chronometers and the magnetic compass.
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| 13. | Other magnetic compasses have a small sliding counterweight installed on the needle itself.
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| 14. | Lodestones, suspended so they could turn, were the first magnetic compasses.
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| 15. | Pilots must compensate for such errors when using the magnetic compass.
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| 16. | Above 85�N both magnetic compasses and normal gyrocompasses become inaccurate.
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| 17. | The Navigator, which has a built-in magnetic compass, will tell them where to look.
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| 18. | The airworthiness certification standards don't specify a standby magnetic compass.
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| 19. | Silk, bronze casting, tea, porcelain, calligraphy and the magnetic compass.
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| 20. | The $ 59.95 Star Navigator uses a conventional magnetic compass.
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