| 1. | Both of these systems are also commonly used with radio navigation systems.
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| 2. | The radio direction finder is the earliest form of radio navigation.
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| 3. | Not depending on celestial navigation, they invested their efforts in radio navigation systems.
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| 4. | All radio navigation beacons are required to monitor their own output.
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| 5. | The airfield has a simple radio navigation beacon and runway lights, but no tower.
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| 6. | In the 1970s, LORAN became the premier radio navigation system.
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| 7. | The airport offers the following radio navigation aids : DME.
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| 8. | Since World War II, radio navigation aids and fish finders have been widely used.
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| 9. | What about other methods, like inertial or radio navigation?
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| 10. | At 60 Group, Fennessy led the operational deployment of many radar and radio navigation systems.
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