| 31. | "There have been some occasions where the ` pingers'and the boxes have separated, " said Marsh.
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| 32. | Powered to broadcast for at least 30 days, the pinger is normally activated only if the recorders are submerged in water.
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| 33. | The British government estimates pingers could cost up to EUR 6, 000 ( US $ 7, 400 ) per boat.
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| 34. | The British government estimated pingers could cost EUR 6, 000 ( US $ 7, 400 ) per boat every year.
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| 35. | Since the pinger signal is relatively weak, the hydrophone must be within about one nautical mile ( ) to detect it.
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| 36. | It's just a sound that it generates so it can be picked up by a hydrophone / Towed pinger locator.
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| 37. | Alt = Diagram of location of ship, thermocline, towed pinger locater at end of tow cable, and blackbox pinger.
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| 38. | Alt = Diagram of location of ship, thermocline, towed pinger locater at end of tow cable, and blackbox pinger.
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| 39. | But investigators believe the still-lost cockpit recorder either lost its pinger or it has been silenced by being socked in muck.
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| 40. | The boxes have pingers that signal their location, but equipment to detect the pings was not expected to be available until Monday.
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