Furuno FSV-84 manual Detecting Fish Schools Aurally

4. SLANT MODE

4.13Detecting 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 built-in speaker.

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.

4.13.1Selecting direction

In the default setting, the audio function is on and the audio sector is 30°.

1.Operate the trackball to place the trackball mark on the direction you want to monitor through the speaker.

2.Press the [R/B AUDIO] key.

The audio bearing mark appears on the bearing selected, in a 30°, 60°, 90°, 180° or 330° sector centering the audio bearing mark. Echoes are monitored through the speaker. You can adjust speaker volume with the [AUDIO] control.

Note: When the trackball mark is placed near own ship mark and the [R/B AUDIO] key is pressed, the range mark and the related data at the bottom of the screen are erased. Note that the audio bearing is erased when “AUDIO” on the ALARM & AUDIO menu is turned off.

A

Audio bearing mark

Range mark

R400m B 45°

Range and audio bearing marks data

Range and audio bearing marks

4-26