| 21. | Magnetic compasses reflect local geomagnetism which includes geomagnetically induced currents caused by space weather.
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| 22. | Magnetic compasses are influenced by any fields other than Earth's.
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| 23. | It also has a remarkable system of magnetic compass orientation.
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| 24. | Just a second ago the logo changed to a sun-like, magnetic compass style thing.
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| 25. | Large ships typically rely on a gyrocompass, using the magnetic compass only as a backup.
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| 26. | The markings are virtually unchanged from the " shi " to the first magnetic compasses.
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| 27. | The magnetic compass is the most familiar compass type.
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| 28. | The primary instrument of navigation is the magnetic compass.
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| 29. | The sea turtles also contain an internal magnetic compass.
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| 30. | The magnetic compass has changed little since it came into use some 2000 years ago.
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