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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.