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