| 41. | Halley proposed this scheme in order to explain anomalous compass readings.
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| 42. | A square root can be constructed with a compass and straightedge.
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| 43. | The correct heading relative to the compass is calculated using trigonometry.
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| 44. | The DoubleTree Hotel and the Compass Bank building are illuminated blue.
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| 45. | North is one of the four cardinal directions or compass points.
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| 46. | Either arrangement is confusing unless the compass points are carefully marked.
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| 47. | Advanced mariners such as Zheng He used 48-point compasses.
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| 48. | Hutton made compasses that were hidden inside pens or tunic buttons.
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| 49. | He had no radio and his compass was 20 years old.
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| 50. | In 1874 the founder Emil Oskar Richter invented the bow compass.
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