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A comment on The Daredevil Camera. Parent comment

Re:The Daredevil Camera by FreeFull on Wednesday June 29, 2016 @06:33PM (#12005329)
Sonar sends out sound and then listens for the echoes though, rather than just take in sound from other sources.
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Re:The Daredevil Camera by votingprawn on Thursday June 30, 2016 @06:24AM (#12007615)
Some types of SONAR send out sound, other types (e.g. [0]) passively listen for sounds and use beamforming to localise the source of the noise.

[0] https://en.wikipedia.org/wiki/Towed_array_sonar

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