Furuno 1943C Benutzerhandbuch

4. VIDEO SOUNDER OPERATION 

 
 

Automatic sounder operation is useful when you are preoccupied with other 
tasks and do not have the time to adjust the display. 
 

The automatic sounder function automatically selects the proper gain, range 
scale and clutter suppression level according to the depth. It works as follows: 
 

• 

The range changes automatically to locate the bottom on the lower half of the 
screen. The range jumps to one step shallower range when the bottom 
echoes reach a half way point of the full scale from the top and to one step 
deeper range when they come to the lower edge of the scale. 

• 

The gain is automatically adjusted to display the bottom echo in reddish brown 
(default color arrangement). 

• 

Clutter, which suppresses low level noise, is automatically adjusted. 

 

Two types of automatic sounder modes are available: CRUISING and FISHING. 
CRUISING is for tracking the bottom, and FISHING is for searching fish schools. 
CRUISING uses a higher clutter rejection setting than FISHING therefore it is not 
recommended for fish detection - weak fish echoes may be erased by the clutter 
suppression circuit. 
 

1.  If not displayed, press the [HIDE/SHOW] key to show the sounder soft keys. 
2.  Press the AUTO/D. BOX soft key. 

AUTO MODE

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CRUISING

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FISHING

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OFF (MANUAL)

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3.  Use the trackball or the [ENTER] knob to select CRUISING or FISHING as 

appropriate. 

4.  Press the RETURN soft key.