| 11. | The navy was using sonar to search for the fuselage Friday.
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| 12. | Officials say its powerful sonar will pinpoint many pieces of wreckage.
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| 13. | Also Sunday, two ships were back out performing sonar probes.
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| 14. | It also has a maritime division that makes torpedoes and sonar.
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| 15. | Bigger companies include Thomas Marconi Sonar, Legrand and Air France.
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| 16. | Passive sonar can detect the sound of other ships'propellers.
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| 17. | He also would clarify what sonar information he had before surfacing.
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| 18. | Authorities used sonar as they continued searching for the other four.
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| 19. | Authorities used sonar and an underwater camera to search the depths.
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| 20. | While military sonar is used intermittently, shipping noise is continuous.
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