| 21. | Most airports in Papua do not have modern navigation aids.
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| 22. | Some airports have outdated navigation aids and inadequate inspection and maintenance facilities and procedures.
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| 23. | Coast Guard crews also concluded navigation aids were working properly.
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| 24. | MAN'S best friend might soon be superseded as a navigation aid for the blind.
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| 25. | You need telephones today, you need navigation aids . ..
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| 26. | As from this date, there was no ATC, navigation aids, runway or fire cover.
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| 27. | Since World War II, radio navigation aids and fish finders have been widely used.
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| 28. | This raised the need for better landing aids, and for night navigation aids in general.
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| 29. | Occasionally the " Waban-Aki " performed navigation aid maintenance.
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| 30. | If the article has navigation aids then the table of contents should reflect that fact.
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