| 31. | They are useful for collecting long fishing lines or fishing nets, with the assistance of a radio direction finder.
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| 32. | When his direction finder hits on the EPIRB distress signal, indicating they've arrived at the scene, Durham swings the helicopter.
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| 33. | Each radio room with a radio direction finder, so that radio messages of other navies could be absorbed from there.
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| 34. | Using a radio direction finder they follow the jamming signal to the alien ship, killing several aliens along the way.
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| 35. | In order to accomplish this, he equipped the Winnie Mae with a Sperry gyroscope autopilot and a radio direction finder.
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| 36. | The exhibition focussed on Bradfield, and included a glass direction finder on the observation level, and various important heritage items.
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| 37. | A complete radio set was to be mounted in all aircraft, along with a radio direction finder for long-range navigation.
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| 38. | The company made advanced aircraft navigation equipment for the market, including the Sperry Gyroscope and the Sperry Radio Direction Finder.
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| 39. | The second advance was the introduction of the automatic direction finder ( ADF ), which completely automated the RDF procedure.
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| 40. | In 1941 RSS began experimenting with Spaced Loop direction finders, developed by the Marconi company and the UK National Physical Laboratories.
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