| 11. | Instead, Aebi had a sextant for celestial navigation and a radio direction finder.
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| 12. | The radio direction finder is the earliest form of radio navigation.
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| 13. | The boat also supports the Simrad TD-L1550 VHF-FM radio direction finder.
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| 14. | Some ships also received a Huff-Duff radio direction finder on a short mainmast.
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| 15. | Lear developed radio direction finders, autopilots, and the first fully automatic aircraft landing system.
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| 16. | There are variants, among the classes, of a radar antenna, interferometric direction finder, COMINT receiver.
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| 17. | Two distinguishing external features of the UC-43 are the circular automatic direction finder R-985 engine.
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| 18. | This consisted of a set of tracking stations using HF / DF radio direction finders.
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| 19. | Anything but the crudest direction finders, however, were expensive luxuries for small-boat handlers until quite recently.
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| 20. | He invented a series of naval instruments, including the direction finder called " Ullrings peileskive ".
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