| 11. | The actual navigation aid is a skeletal tower erected in 1970.
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| 12. | A secondary red light acts as a navigation aid for vessels sailing south southeast.
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| 13. | Occasionally the " Sipu Muin " performs navigation aid maintenance.
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| 14. | It was formerly used as a navigation aid for ships.
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| 15. | This is the oldest type of navigation aid there is,
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| 16. | Mannesmann already has a separate subsidiary, Autocom, that provides navigation aids through wireless networks.
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| 17. | Models loaded with marine navigation aids can also be used for fishing and boating.
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| 18. | So it's useless as navigation aid and misleading as a tool of article categorization.
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| 19. | The British, who had developed similar navigation aids, faced the same problem of quantity.
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| 20. | The airport offers the following radio navigation aids : DME.
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