SONAR 2 : The acronym for Sound Navigation and Ranging, a technique used at sea for detecting and determining the position of underwater objects (e.g., sunken ships, schools of fish), and for determining the depth of the water under a ship
Intergovernmental Oceanographic Commission IOC technical series 37, Tsunami Glossary (A glossary of terms and acronyms used in the tsunami literature - English), , United Nations Educational, Scientific and Cultural Organization UNESCO, Paris, France 1991. http://unesdoc.unesco.org/images/0008/000885/08853 8eb.pdf, (ND/ Tsunami Sci - Brit) {590}