ISBN 9781603442183. Archived from the original on 2018-04-26. ↑ http://www.km.kongsberg.com/ks/web/nokbg0397.nsf/AllWeb/99DDBE721D20AD5FC125775A002A2E60/$file/GeoAcoustics-2094-digital-data-sheet.pdf?OpenElement ↑ "JW Fishers - High Frequency Side Scan Sonar".