It is a vessel-mounted system consisting of a single 52-element emission/reception transducer with electronic beam steering to allow for measurement along 5 axes, and a cable to the signal- processing electronics.
The computer performs calculations similar to those performed by our Doppler Sodars, which use acoustic waves for remote measurement of wind.
A recent round of testing has shown that depths beyond 1000 meters can be reached given one- minute averaging periods on a boat moving at a speed of five knots.

Real-Time display of echo and current velocity relative to ship during a short transect in the Mediterranean sea. The ship was moving about 3 knots for the first period, and at about 4.5 knots in the second period. Range was limited due to water depth