| 21. | Old Baldy was downgraded from a lighthouse to a navigational radio beacon in 1935.
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| 22. | As of 2001, both the light and radio beacon served as active navigational aids.
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| 23. | Rather than using radio beacons, the airplane uses GPS-navigation for landing using this technique.
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| 24. | The pilots missed a radio beacon that should have guided them to a landing.
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| 25. | Historical brick dock, wooden boathouse ( 1 mile distant ) and a radio beacon.
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| 26. | Nautel delivered its first transmitter, a radio beacon for the Canadian government, in 1970.
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| 27. | Ground units were BS 15 navigation radio beacons constructed from rebuilt FuG 15 sets.
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| 28. | The British had jammed German radio beacons and switched on others with the same frequency.
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| 29. | Erik digs up a radio beacon that eventually will alert the CIA to their presence.
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| 30. | However, these low-frequency radio beacons are subject to disturbance from lightning, rain and static electricity.
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