Filter
Top Products
3. ADVANCED SONAR OPERATION
3-2
3.2 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 bottom
through the built-in speaker.
After you've become accustomed to monitoring fish aurally, you should be able to de-
tect 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 be-
comes higher when the school is approaching and lower when the school is going
away.
1. Operate the trackball to place the trackball mark on the direction you want to mon-
itor through the speaker. (If the trackball mark is placed on the own ship mark
when the R/B key is pressed, the range and bearing marks and range and bearing
marks data are erased.)
2. Press the R/B key. The bearing mark appears on the bearing selected with the
trackball mark. Listen to echoes through the loudspeaker. You may adjust the vol-
ume of the loudspeaker with [AUDIO VOLUME] on the [SONAR] menu.
3. To change aural coverage area, do the following:
a) Press the MENU key to open the menu.
b) Use the RANGE control to choose [MENU MODE] at the top of the screen.
c) Use the GAIN control to choose [SONAR].
d) Use the RANGE control to choose [AUTO TRAIN].
e) Use the GAIN control to choose [ON].
f) Use the RANGE control to choose [TRAIN SECTOR].
g) Use the GAIN control to choose train sector among [±10°], [±20°], [±40°] and
[±60°].
h) Press the MENU key to close the menu. Then, automatic training starts, cen-
tered on the bearing mark.
To turn off automatic training, choose [OFF] at step e).
R 400 B 45S*
Train Sector
Bearing Mark
Range Mark
Range and bearing marks data
* = Relative bearing format may be chosen
with [OTHER MARKS] in the [MARKS] menu.