| 31. | :: I believe that stars still are used as navigation aids by many indigenous people.
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| 32. | Early submarines had few navigation aids, but modern subs have a variety of navigation systems.
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| 33. | The Coast Guard continues to maintain the navigation aids.
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| 34. | The navigation aid remained in continuous use until 22 March 1985 when it was decommissioned.
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| 35. | The Federal Aviation Administration formerly planned to use GPS to replace all ground-based navigation aids.
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| 36. | All three methods serve as navigation aids on Wikipedia.
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| 37. | Mariners have tried for nearly 200 years to improve the navigation aids in the area.
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| 38. | The Joint Chiefs of Staff will also consider upgrading helicopter navigation aids, the official said.
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| 39. | The board colors are provided as a navigation aid.
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| 40. | Without navigation aids, the clouds can become blinding.
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