| Definition: A contraction of sound navigation and ranging, formally includes the active mode in which a pulse goes out and a receiver measures the echo. Also includes hydrophones or passive, listen-only systems. [d] [e]
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| Workgroup categories: Military Workgroup, Engineering Workgroup, Physics Workgroup [Categories OK]
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| Article status: Stub (no more than a few sentences)
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| English language variant: American English
| Underlinked article?: No
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| Talk Archive: none (to start Archive 1)
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