Detecting Fish Schools Aurally
Sometimes you may be preoccupied with other tasks and unable to concentrate on watching the sonar picture. In such cases it would be a good choice to use the audio function. This function enables you to monitor echoes from fish schools and seabed through the
After you’ve become accustomed to monitoring fish aurally, you should be able to detect a fish school from a range longer than you can detect it on the screen. In addition you may judge whether the fish school is approaching or going away; the tone becomes higher when the school is approaching and lowers when the school is going away.
1.Operate the trackball to place the trackball mark to the direc- tion you want to monitor through the speaker.
2.Press the R/B key. The bearing mark appears on the display. Echoes in a 30° , 60° , 90° , 180° or 330° sector centering the bearing mark are monitored through the speaker. You can adjust speaker volume with the AUDIO control.
3.To change coverage area, open the data setting window (sub panel 2) and change width of AUDIO SECTOR.
4.To scan the coverage area, open the data setting window, turn on AUTO SCAN and set scanning WIDTH.
Note: You can display the signal monitored through the loud- speaker on the history display combination window by pressing the HIST key, if AUDIO is selected on the HIST Window DSP menu in the USER menu.