The operator is able to aquot;homeaquot; on to a school once it has been detected by means of the manual control. ... A typical horizontal echo-ranging sonar working at 30 kHz might have a beam- width of 10Ad x 10Ad with a switch to change the verticalanbsp;...
|Title||:||Manual of Sampling and Statistical Methods for Fisheries Biology|
|Author||:||J. A. Gulland|