| 31. | A good navigational aid should be clear to all readers.
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| 32. | Ground navigational aids were functioning normally Wednesday night, he said.
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| 33. | A navigational aid hadn't been friendly to Flischel once before.
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| 34. | The helicopter was not equipped with a more advanced navigational aid called global-positioning system.
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| 35. | New airfield ground lighting and navigational aids were also installed.
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| 36. | Templates come into their own as part of an article as a navigational aid.
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| 37. | One of the most urgent problems of the Command was thus to develop navigational aids.
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| 38. | The south pier has a steel tower navigational aid.
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| 39. | Today it is the oldest standing navigational aid of any kind in the United States.
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| 40. | WACs show topographic information, airports and radio navigational aids.
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