From July 12 to August 8, 2016, Vector Marine Electronics, Ltd specialists were in flight No. 34 of the R / V “Issledovatel Caspiya” across the Caspian Sea. During the voyage, an experimental test was carried out of the possibility of using the Sector scientific multibeam echo sounder for detecting fish in a wide viewing band. Simultaneous hydroacoustic recordings were obtained from the scientific multi-beam echo sounder of Sector and the scientific echo sounder Simrad EK60. Comparison of records showed the advantage of a wide swath of a multibeam echo sounder over a narrow swath of the Simrad EK60 echo sounder read more