| 21. | This may be supplemented using radio navigation aids.
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| 22. | VLF is also used for radio navigation beacons ( alpha ) and time signals ( beta ).
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| 23. | Flight into Instrument meteorological conditions ( IMC ) require radio navigation instruments for precise takeoffs and landings.
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| 24. | It was possible to take advantage of the weather station and radio navigation equipment at Slettnes Lighthouse.
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| 25. | Later radio navigation systems were more accurate.
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| 26. | The British developed a radio navigation system called " line-of-sight, about for aircraft flying at typical mission altitudes.
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| 27. | Near Dudinka there is a tall radio mast which was formerly used for the CHAYKA radio navigation system.
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| 28. | This helped to overcome the lag in West German research on radar and radio navigation after the war.
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| 29. | The nearest radio navigation aid for pilots is the Goulburn Non-Directional Beacon installation located within the airport boundary.
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| 30. | This would save the FAA millions of dollars every year in maintenance of their own radio navigation systems.
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