| 21. | Examples are sonar, radar, lidar, laser, scuba.
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| 22. | Since 2000, whale strandings frequently occurred following military sonar testing.
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| 23. | Other early examples were analyzing sonar data to detect Russian submarines.
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| 24. | Long-range sonar uses low frequencies to minimise absorption effects.
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| 25. | Modern torpedoes are generally fitted with an active / passive sonar.
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| 26. | Sonar can be used to detect frogmen and other scuba divers.
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| 27. | An explanation of their operation is given in synthetic aperture sonar.
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| 28. | Longer range sonars are more adversely affected by nonhomogenities of water.
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| 29. | The submarines carry the Thales Underwater Systems Type 2054 composite sonar.
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| 30. | Avoiding sonar inevitably requires a change in behavior or surfacing pattern.
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