| 41. | In some cases _ very rare cases _ we find the black boxes with the pingers on them, sitting in the open,
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| 42. | But the " pingers " paid off, and investigators were able to recover the black boxes, hastening the investigation.
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| 43. | The rules would oblige skippers to install acoustic " pingers " designed to scare away dolphins and porpoises from fishing boats.
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| 44. | Modern sonic configurations with pingers and microphones at both ends of the log, combined with computer analysis, minimize the averaging somewhat.
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| 45. | The NSW and Queensland also utilse acoustic pingers attached to the nets to reduce bycatch of dolphins, whales and other marine mammals.
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| 46. | Moreover, Pinger has a web based version of its application that allows users to send and receive text messages directly from computer.
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| 47. | The pinger has a very limited limited range so a search ship would have to be close to it to pick it up.
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| 48. | The devices are also equipped with a " pinger " that emits a high frequency signal to help investigators locate the box.
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| 49. | Those " black boxes " carry pingers that are activated by water and send out audio signals so they can be easily located.
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| 50. | Investigators said the pingers appear to be tantalizingly close together _ as near as 15 feet apart _ and that their signals were remarkably strong.
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