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Dynamics of Ocean Currents and Fronts
Physical Oceanography
Graduate School of Oceanography
University of Rhode Island
Narragansett, RI 02882

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Inverted Echo Sounders (IES/PIES/CPIES)
  1. Introduction
  2. Scientific
  3. Technical
  4. Documentation
  5. History
  6. Launch/
    Recovery Movies
  7. How to Buy
  8. Photo Gallery
  9. IES Publications


The Inverted Echo Sounder (IES) is an ocean bottom-moored instrument that measures vertical acoustic travel time ( VATT ) round trip from the sea floor to the sea surface. With an optional Paroscientific pressure sensor, the instrument is designated a PIES. A combined IES, data-logger, and acoustic release with both Paroscientific pressure and Aanderaa current sensors is called a CPIES (see schematic below). GSO/URI currently produces Model 6.2 IES.

CPIES Schematic

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