The Nootka buoy "... uses acoustic telemetry to send information through the water in bursts of sound waves. A computer mounted on the buoy receives data from up to 15 instruments lying on the sea bottom within about a 20-square-kilometer area (7.7 square miles)." - <a rel="nofollow" class="external free" href="http://www.whoi.edu/instruments/viewInstrument.do?id=9966">http://www.whoi.edu/instruments/viewInstrument.do?id=9966</a>.
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<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/takomabibelot/2064620860/">Solar-Powered, Satellite-Linked, Acoustic-Wireless Deepwater Nootka Buoy, Docked At WHOI (Woods Hole, MA)</a>