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A digitally controlled acoustic system for measurement of ocean depths by echo sounding is described. This automatic digital depth (ADD) system was developed at W. H. O. I. to provide depth information directly to a shipboard digital computer. Automatic range gating prevents false depth readings from echoes returned from shallow, midwater reflectors. Readout is both visual, on a lighted digital display and electrical in the form of a binary coded decimal (BCD) output. The depth is read directly in fathoms based on 4800 feet per second sound velocity. Other units of depth may be used with little change in circuitry.

Document Type: Research Article


Publication date: June 1, 2006

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  • The Marine Technology Society Journal is the flagship publication of the Marine Technology Society. It publishes the highest caliber, peer-reviewed papers on subjects of interest to the society: marine technology, ocean science, marine policy and education. The Journal is dedicated to publishing timely special issues on emerging ocean community concerns while also showcasing general interest and student-authored works.
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