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What is the difference between a passive and active sonobouy?

April 26, 2017active passive

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What is the difference between a passive and active sonobouy?

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Passive sonobuoys use passive sonar. Active sonobuoys will give a more positive location on the enemy, but can be easily detected by submarines and tells them how close to being discovered they are. Active sonobuoys are also useful in shallow water, where all passive sonar works poorly.