If you are wanting to collect great backscatter data to create mosaics then this poster from Jonathan Beaudoin is a must read. It shows you how to set the sonar up, use SVP data and then process it in FMGT. Download the poster and stick it on your wall here http://www.qps.nl/download/attachments/14352930/beaudoin_r2sonic_poster.pdf?version=1&modificationDate=1400116368523